Evp_encryptinit_ex Example

  1. Openssl Evp_encryptinit_ex Example
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  3. Evp_encryptinit_ex Example In Java
  4. Evp_encryptinit_ex Example Text
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1.1.1e
Aliases: EVP_aes_128_cbc(3ssl), EVP_aes_128_cbc(3ssl), EVP_aes_128_cbc(3ssl), EVP_aes_128_cbc(3ssl), EVP_aes_128_cbc_hmac_sha1(3ssl), EVP_aes_128_cbc_hmac_sha1(3ssl), EVP_aes_128_cbc_hmac_sha1(3ssl), EVP_aes_128_cbc_hmac_sha1(3ssl), EVP_aes_128_cbc_hmac_sha1(3ssl), EVP_aes_128_cbc_hmac_sha1(3ssl), EVP_aes_128_cbc_hmac_sha256(3ssl), EVP_aes_128_cbc_hmac_sha256(3ssl), EVP_aes_128_cbc_hmac_sha256(3ssl), EVP_aes_128_cbc_hmac_sha256(3ssl), EVP_aes_128_cbc_hmac_sha256(3ssl), EVP_aes_128_cbc_hmac_sha256(3ssl), EVP_aes_128_ccm(3ssl), EVP_aes_128_ccm(3ssl), EVP_aes_128_ccm(3ssl), EVP_aes_128_ccm(3ssl), EVP_aes_128_ccm(3ssl), EVP_aes_128_ccm(3ssl), EVP_aes_128_ccm(3ssl), EVP_aes_128_cfb(3ssl), EVP_aes_128_cfb(3ssl), EVP_aes_128_cfb(3ssl), EVP_aes_128_cfb(3ssl), EVP_aes_128_ecb(3ssl), EVP_aes_128_ecb(3ssl), EVP_aes_128_ecb(3ssl), EVP_aes_128_ecb(3ssl), EVP_aes_128_gcm(3ssl), EVP_aes_128_gcm(3ssl), EVP_aes_128_gcm(3ssl), EVP_aes_128_gcm(3ssl), EVP_aes_128_gcm(3ssl), EVP_aes_128_gcm(3ssl), EVP_aes_128_gcm(3ssl), EVP_aes_128_ofb(3ssl), EVP_aes_128_ofb(3ssl), EVP_aes_128_ofb(3ssl), EVP_aes_128_ofb(3ssl), EVP_aes_192_cbc(3ssl), EVP_aes_192_cbc(3ssl), EVP_aes_192_cbc(3ssl), EVP_aes_192_cbc(3ssl), EVP_aes_192_ccm(3ssl), EVP_aes_192_ccm(3ssl), EVP_aes_192_ccm(3ssl), EVP_aes_192_ccm(3ssl), EVP_aes_192_ccm(3ssl), EVP_aes_192_ccm(3ssl), EVP_aes_192_ccm(3ssl), EVP_aes_192_cfb(3ssl), EVP_aes_192_cfb(3ssl), EVP_aes_192_cfb(3ssl), EVP_aes_192_cfb(3ssl), EVP_aes_192_ecb(3ssl), EVP_aes_192_ecb(3ssl), EVP_aes_192_ecb(3ssl), EVP_aes_192_ecb(3ssl), EVP_aes_192_gcm(3ssl), EVP_aes_192_gcm(3ssl), EVP_aes_192_gcm(3ssl), EVP_aes_192_gcm(3ssl), EVP_aes_192_gcm(3ssl), EVP_aes_192_gcm(3ssl), EVP_aes_192_gcm(3ssl), EVP_aes_192_ofb(3ssl), EVP_aes_192_ofb(3ssl), EVP_aes_192_ofb(3ssl), EVP_aes_192_ofb(3ssl), EVP_aes_256_cbc(3ssl), EVP_aes_256_cbc(3ssl), EVP_aes_256_cbc(3ssl), EVP_aes_256_cbc(3ssl), EVP_aes_256_cbc_hmac_sha1(3ssl), EVP_aes_256_cbc_hmac_sha1(3ssl), EVP_aes_256_cbc_hmac_sha1(3ssl), EVP_aes_256_cbc_hmac_sha1(3ssl), EVP_aes_256_cbc_hmac_sha1(3ssl), EVP_aes_256_cbc_hmac_sha1(3ssl), EVP_aes_256_cbc_hmac_sha256(3ssl), EVP_aes_256_cbc_hmac_sha256(3ssl), EVP_aes_256_cbc_hmac_sha256(3ssl), EVP_aes_256_cbc_hmac_sha256(3ssl), EVP_aes_256_cbc_hmac_sha256(3ssl), EVP_aes_256_cbc_hmac_sha256(3ssl), EVP_aes_256_cbc_hmac_sha256EVP_chacha20(3ssl), EVP_aes_256_cbc_hmac_sha256EVP_chacha20(3ssl), EVP_aes_256_ccm(3ssl), EVP_aes_256_ccm(3ssl), EVP_aes_256_ccm(3ssl), EVP_aes_256_ccm(3ssl), EVP_aes_256_ccm(3ssl), EVP_aes_256_ccm(3ssl), EVP_aes_256_ccm(3ssl), EVP_aes_256_cfb(3ssl), EVP_aes_256_cfb(3ssl), EVP_aes_256_cfb(3ssl), EVP_aes_256_cfb(3ssl), EVP_aes_256_ecb(3ssl), EVP_aes_256_ecb(3ssl), EVP_aes_256_ecb(3ssl), EVP_aes_256_ecb(3ssl), EVP_aes_256_gcm(3ssl), EVP_aes_256_gcm(3ssl), EVP_aes_256_gcm(3ssl), EVP_aes_256_gcm(3ssl), EVP_aes_256_gcm(3ssl), EVP_aes_256_gcm(3ssl), EVP_aes_256_gcm(3ssl), EVP_aes_256_ofb(3ssl), EVP_aes_256_ofb(3ssl), EVP_aes_256_ofb(3ssl), EVP_aes_256_ofb(3ssl), EVP_bf_cbc(3ssl), EVP_bf_cbc(3ssl), EVP_bf_cbc(3ssl), EVP_bf_cbc(3ssl), EVP_bf_cbc(3ssl), EVP_bf_cbc(3ssl), EVP_bf_cbc(3ssl), EVP_bf_cfb(3ssl), EVP_bf_cfb(3ssl), EVP_bf_cfb(3ssl), EVP_bf_cfb(3ssl), EVP_bf_cfb(3ssl), EVP_bf_cfb(3ssl), EVP_bf_cfb(3ssl), EVP_bf_ecb(3ssl), EVP_bf_ecb(3ssl), EVP_bf_ecb(3ssl), EVP_bf_ecb(3ssl), EVP_bf_ecb(3ssl), EVP_bf_ecb(3ssl), EVP_bf_ecb(3ssl), EVP_bf_ofb(3ssl), EVP_bf_ofb(3ssl), EVP_bf_ofb(3ssl), EVP_bf_ofb(3ssl), EVP_bf_ofb(3ssl), EVP_bf_ofb(3ssl), EVP_bf_ofb(3ssl), EVP_cast5_cbc(3ssl), EVP_cast5_cbc(3ssl), EVP_cast5_cbc(3ssl), EVP_cast5_cbc(3ssl), EVP_cast5_cbc(3ssl), EVP_cast5_cbc(3ssl), EVP_cast5_cbc(3ssl), EVP_cast5_cfb(3ssl), EVP_cast5_cfb(3ssl), EVP_cast5_cfb(3ssl), EVP_cast5_cfb(3ssl), EVP_cast5_cfb(3ssl), EVP_cast5_cfb(3ssl), EVP_cast5_cfb(3ssl), EVP_cast5_ecb(3ssl), EVP_cast5_ecb(3ssl), EVP_cast5_ecb(3ssl), EVP_cast5_ecb(3ssl), EVP_cast5_ecb(3ssl), EVP_cast5_ecb(3ssl), EVP_cast5_ecb(3ssl), EVP_cast5_ofb(3ssl), EVP_cast5_ofb(3ssl), EVP_cast5_ofb(3ssl), EVP_cast5_ofb(3ssl), EVP_cast5_ofb(3ssl), EVP_cast5_ofb(3ssl), EVP_cast5_ofb(3ssl), EVP_chacha20(3ssl), EVP_chacha20(3ssl), EVP_chacha20(3ssl), EVP_chacha20(3ssl), EVP_chacha20_poly1305(3ssl), EVP_chacha20_poly1305(3ssl), EVP_chacha20_poly1305(3ssl), EVP_chacha20_poly1305(3ssl), EVP_CipherFinal(3ssl), EVP_CipherFinal(3ssl), EVP_CipherFinal(3ssl), EVP_CipherFinal(3ssl), EVP_CipherFinal(3ssl), EVP_CipherFinal(3ssl), EVP_CipherFinal(3ssl), EVP_CipherFinal_ex(3ssl), EVP_CipherFinal_ex(3ssl), EVP_CipherFinal_ex(3ssl), EVP_CipherFinal_ex(3ssl), EVP_CipherFinal_ex(3ssl), EVP_CipherFinal_ex(3ssl), EVP_CipherFinal_ex(3ssl), EVP_CipherInit(3ssl), EVP_CipherInit(3ssl), EVP_CipherInit(3ssl), EVP_CipherInit(3ssl), EVP_CipherInit(3ssl), EVP_CipherInit(3ssl), EVP_CipherInit(3ssl), EVP_CipherInit_ex(3ssl), EVP_CipherInit_ex(3ssl), EVP_CipherInit_ex(3ssl), EVP_CipherInit_ex(3ssl), EVP_CipherInit_ex(3ssl), EVP_CipherInit_ex(3ssl), EVP_CipherInit_ex(3ssl), EVP_CipherUpdate(3ssl), EVP_CipherUpdate(3ssl), EVP_CipherUpdate(3ssl), EVP_CipherUpdate(3ssl), EVP_CipherUpdate(3ssl), EVP_CipherUpdate(3ssl), EVP_CipherUpdate(3ssl), EVP_CIPHER_asn1_to_param(3ssl), EVP_CIPHER_asn1_to_param(3ssl), EVP_CIPHER_asn1_to_param(3ssl), EVP_CIPHER_asn1_to_param(3ssl), EVP_CIPHER_asn1_to_param(3ssl), EVP_CIPHER_asn1_to_param(3ssl), EVP_CIPHER_asn1_to_param(3ssl), EVP_CIPHER_block_size(3ssl), EVP_CIPHER_block_size(3ssl), EVP_CIPHER_block_size(3ssl), EVP_CIPHER_block_size(3ssl), EVP_CIPHER_block_size(3ssl), EVP_CIPHER_block_size(3ssl), EVP_CIPHER_block_size(3ssl), EVP_CIPHER_CTX_block_size(3ssl), EVP_CIPHER_CTX_block_size(3ssl), EVP_CIPHER_CTX_block_size(3ssl), EVP_CIPHER_CTX_block_size(3ssl), EVP_CIPHER_CTX_block_size(3ssl), EVP_CIPHER_CTX_block_size(3ssl), EVP_CIPHER_CTX_block_size(3ssl), EVP_CIPHER_CTX_cipher(3ssl), EVP_CIPHER_CTX_cipher(3ssl), EVP_CIPHER_CTX_cipher(3ssl), EVP_CIPHER_CTX_cipher(3ssl), EVP_CIPHER_CTX_cipher(3ssl), EVP_CIPHER_CTX_cipher(3ssl), EVP_CIPHER_CTX_cipher(3ssl), EVP_CIPHER_CTX_cleanup(3ssl), EVP_CIPHER_CTX_cleanup(3ssl), EVP_CIPHER_CTX_cleanup(3ssl), EVP_CIPHER_CTX_cleanup(3ssl), EVP_CIPHER_CTX_cleanup(3ssl), EVP_CIPHER_CTX_ctrl(3ssl), EVP_CIPHER_CTX_ctrl(3ssl), EVP_CIPHER_CTX_ctrl(3ssl), EVP_CIPHER_CTX_ctrl(3ssl), EVP_CIPHER_CTX_ctrl(3ssl), EVP_CIPHER_CTX_ctrl(3ssl), EVP_CIPHER_CTX_ctrl(3ssl), EVP_CIPHER_CTX_flags(3ssl), EVP_CIPHER_CTX_flags(3ssl), EVP_CIPHER_CTX_flags(3ssl), EVP_CIPHER_CTX_flags(3ssl), EVP_CIPHER_CTX_flags(3ssl), EVP_CIPHER_CTX_flags(3ssl), EVP_CIPHER_CTX_flags(3ssl), EVP_CIPHER_CTX_free(3ssl), EVP_CIPHER_CTX_free(3ssl), EVP_CIPHER_CTX_free(3ssl), EVP_CIPHER_CTX_free(3ssl), EVP_CIPHER_CTX_get_app_data(3ssl), EVP_CIPHER_CTX_get_app_data(3ssl), EVP_CIPHER_CTX_get_app_data(3ssl), EVP_CIPHER_CTX_get_app_data(3ssl), EVP_CIPHER_CTX_get_app_data(3ssl), EVP_CIPHER_CTX_get_app_data(3ssl), EVP_CIPHER_CTX_get_app_data(3ssl), EVP_CIPHER_CTX_init(3ssl), EVP_CIPHER_CTX_init(3ssl), EVP_CIPHER_CTX_init(3ssl), EVP_CIPHER_CTX_init(3ssl), EVP_CIPHER_CTX_init(3ssl), EVP_CIPHER_CTX_iv_length(3ssl), EVP_CIPHER_CTX_iv_length(3ssl), EVP_CIPHER_CTX_iv_length(3ssl), EVP_CIPHER_CTX_iv_length(3ssl), EVP_CIPHER_CTX_iv_length(3ssl), EVP_CIPHER_CTX_iv_length(3ssl), EVP_CIPHER_CTX_iv_length(3ssl), EVP_CIPHER_CTX_key_length(3ssl), EVP_CIPHER_CTX_key_length(3ssl), EVP_CIPHER_CTX_key_length(3ssl), EVP_CIPHER_CTX_key_length(3ssl), EVP_CIPHER_CTX_key_length(3ssl), EVP_CIPHER_CTX_key_length(3ssl), EVP_CIPHER_CTX_key_length(3ssl), EVP_CIPHER_CTX_mode(3ssl), EVP_CIPHER_CTX_mode(3ssl), EVP_CIPHER_CTX_mode(3ssl), EVP_CIPHER_CTX_mode(3ssl), EVP_CIPHER_CTX_mode(3ssl), EVP_CIPHER_CTX_mode(3ssl), EVP_CIPHER_CTX_mode(3ssl), EVP_CIPHER_CTX_new(3ssl), EVP_CIPHER_CTX_new(3ssl), EVP_CIPHER_CTX_new(3ssl), EVP_CIPHER_CTX_new(3ssl), EVP_CIPHER_CTX_nid(3ssl), EVP_CIPHER_CTX_nid(3ssl), EVP_CIPHER_CTX_nid(3ssl), EVP_CIPHER_CTX_nid(3ssl), EVP_CIPHER_CTX_nid(3ssl), EVP_CIPHER_CTX_nid(3ssl), EVP_CIPHER_CTX_nid(3ssl), EVP_CIPHER_CTX_reset(3ssl), EVP_CIPHER_CTX_reset(3ssl), EVP_CIPHER_CTX_reset(3ssl), EVP_CIPHER_CTX_reset(3ssl), EVP_CIPHER_CTX_set_app_data(3ssl), EVP_CIPHER_CTX_set_app_data(3ssl), EVP_CIPHER_CTX_set_app_data(3ssl), EVP_CIPHER_CTX_set_app_data(3ssl), EVP_CIPHER_CTX_set_app_data(3ssl), EVP_CIPHER_CTX_set_app_data(3ssl), EVP_CIPHER_CTX_set_app_data(3ssl), EVP_CIPHER_CTX_set_key_length(3ssl), EVP_CIPHER_CTX_set_key_length(3ssl), EVP_CIPHER_CTX_set_key_length(3ssl), EVP_CIPHER_CTX_set_key_length(3ssl), EVP_CIPHER_CTX_set_key_length(3ssl), EVP_CIPHER_CTX_set_key_length(3ssl), EVP_CIPHER_CTX_set_key_length(3ssl), EVP_CIPHER_CTX_set_padding(3ssl), EVP_CIPHER_CTX_set_padding(3ssl), EVP_CIPHER_CTX_set_padding(3ssl), EVP_CIPHER_CTX_set_padding(3ssl), EVP_CIPHER_CTX_set_padding(3ssl), EVP_CIPHER_CTX_set_padding(3ssl), EVP_CIPHER_CTX_set_padding(3ssl), EVP_CIPHER_CTX_type(3ssl), EVP_CIPHER_CTX_type(3ssl), EVP_CIPHER_CTX_type(3ssl), EVP_CIPHER_CTX_type(3ssl), EVP_CIPHER_CTX_type(3ssl), EVP_CIPHER_CTX_type(3ssl), EVP_CIPHER_CTX_type(3ssl), EVP_CIPHER_flags(3ssl), EVP_CIPHER_flags(3ssl), EVP_CIPHER_flags(3ssl), EVP_CIPHER_flags(3ssl), EVP_CIPHER_flags(3ssl), EVP_CIPHER_flags(3ssl), EVP_CIPHER_flags(3ssl), EVP_CIPHER_iv_length(3ssl), EVP_CIPHER_iv_length(3ssl), EVP_CIPHER_iv_length(3ssl), EVP_CIPHER_iv_length(3ssl), EVP_CIPHER_iv_length(3ssl), EVP_CIPHER_iv_length(3ssl), EVP_CIPHER_iv_length(3ssl), EVP_CIPHER_key_length(3ssl), EVP_CIPHER_key_length(3ssl), EVP_CIPHER_key_length(3ssl), EVP_CIPHER_key_length(3ssl), EVP_CIPHER_key_length(3ssl), EVP_CIPHER_key_length(3ssl), EVP_CIPHER_key_length(3ssl), EVP_CIPHER_mode(3ssl), EVP_CIPHER_mode(3ssl), EVP_CIPHER_mode(3ssl), EVP_CIPHER_mode(3ssl), EVP_CIPHER_mode(3ssl), EVP_CIPHER_mode(3ssl), EVP_CIPHER_mode(3ssl), EVP_CIPHER_nid(3ssl), EVP_CIPHER_nid(3ssl), EVP_CIPHER_nid(3ssl), EVP_CIPHER_nid(3ssl), EVP_CIPHER_nid(3ssl), EVP_CIPHER_nid(3ssl), EVP_CIPHER_nid(3ssl), EVP_CIPHER_param_to_asn1(3ssl), EVP_CIPHER_param_to_asn1(3ssl), EVP_CIPHER_param_to_asn1(3ssl), EVP_CIPHER_param_to_asn1(3ssl), EVP_CIPHER_param_to_asn1(3ssl), EVP_CIPHER_param_to_asn1(3ssl), EVP_CIPHER_param_to_asn1(3ssl), EVP_CIPHER_type(3ssl), EVP_CIPHER_type(3ssl), EVP_CIPHER_type(3ssl), EVP_CIPHER_type(3ssl), EVP_CIPHER_type(3ssl), EVP_CIPHER_type(3ssl), EVP_CIPHER_type(3ssl), EVP_DecryptFinal(3ssl), EVP_DecryptFinal(3ssl), EVP_DecryptFinal(3ssl), EVP_DecryptFinal(3ssl), EVP_DecryptFinal(3ssl), EVP_DecryptFinal(3ssl), EVP_DecryptFinal(3ssl), EVP_DecryptFinal_ex(3ssl), EVP_DecryptFinal_ex(3ssl), EVP_DecryptFinal_ex(3ssl), EVP_DecryptFinal_ex(3ssl), EVP_DecryptFinal_ex(3ssl), EVP_DecryptFinal_ex(3ssl), EVP_DecryptFinal_ex(3ssl), EVP_DecryptInit(3ssl), EVP_DecryptInit(3ssl), EVP_DecryptInit(3ssl), EVP_DecryptInit(3ssl), EVP_DecryptInit(3ssl), EVP_DecryptInit(3ssl), EVP_DecryptInit(3ssl), EVP_DecryptInit_ex(3ssl), EVP_DecryptInit_ex(3ssl), EVP_DecryptInit_ex(3ssl), EVP_DecryptInit_ex(3ssl), EVP_DecryptInit_ex(3ssl), EVP_DecryptInit_ex(3ssl), EVP_DecryptInit_ex(3ssl), EVP_DecryptUpdate(3ssl), EVP_DecryptUpdate(3ssl), EVP_DecryptUpdate(3ssl), EVP_DecryptUpdate(3ssl), EVP_DecryptUpdate(3ssl), EVP_DecryptUpdate(3ssl), EVP_DecryptUpdate(3ssl), EVP_desx_cbc(3ssl), EVP_desx_cbc(3ssl), EVP_desx_cbc(3ssl), EVP_desx_cbc(3ssl), EVP_desx_cbc(3ssl), EVP_desx_cbc(3ssl), EVP_desx_cbc(3ssl), EVP_des_cbc(3ssl), EVP_des_cbc(3ssl), EVP_des_cbc(3ssl), EVP_des_cbc(3ssl), EVP_des_cbc(3ssl), EVP_des_cbc(3ssl), EVP_des_cbc(3ssl), EVP_des_cfb(3ssl), EVP_des_cfb(3ssl), EVP_des_cfb(3ssl), EVP_des_cfb(3ssl), EVP_des_cfb(3ssl), EVP_des_cfb(3ssl), EVP_des_cfb(3ssl), EVP_des_ecb(3ssl), EVP_des_ecb(3ssl), EVP_des_ecb(3ssl), EVP_des_ecb(3ssl), EVP_des_ecb(3ssl), EVP_des_ecb(3ssl), EVP_des_ecb(3ssl), EVP_des_ede(3ssl), EVP_des_ede(3ssl), EVP_des_ede(3ssl), EVP_des_ede(3ssl), EVP_des_ede(3ssl), EVP_des_ede(3ssl), EVP_des_ede(3ssl), EVP_des_ede3(3ssl), EVP_des_ede3(3ssl), EVP_des_ede3(3ssl), EVP_des_ede3(3ssl), EVP_des_ede3(3ssl), EVP_des_ede3(3ssl), EVP_des_ede3(3ssl), EVP_des_ede3_cbc(3ssl), EVP_des_ede3_cbc(3ssl), EVP_des_ede3_cbc(3ssl), EVP_des_ede3_cbc(3ssl), EVP_des_ede3_cbc(3ssl), EVP_des_ede3_cbc(3ssl), EVP_des_ede3_cbc(3ssl), EVP_des_ede3_cfb(3ssl), EVP_des_ede3_cfb(3ssl), EVP_des_ede3_cfb(3ssl), EVP_des_ede3_cfb(3ssl), EVP_des_ede3_cfb(3ssl), EVP_des_ede3_cfb(3ssl), EVP_des_ede3_cfb(3ssl), EVP_des_ede3_ofb(3ssl), EVP_des_ede3_ofb(3ssl), EVP_des_ede3_ofb(3ssl), EVP_des_ede3_ofb(3ssl), EVP_des_ede3_ofb(3ssl), EVP_des_ede3_ofb(3ssl), EVP_des_ede3_ofb(3ssl), EVP_des_ede_cbc(3ssl), EVP_des_ede_cbc(3ssl), EVP_des_ede_cbc(3ssl), EVP_des_ede_cbc(3ssl), EVP_des_ede_cbc(3ssl), EVP_des_ede_cbc(3ssl), EVP_des_ede_cbc(3ssl), EVP_des_ede_cfb(3ssl), EVP_des_ede_cfb(3ssl), EVP_des_ede_cfb(3ssl), EVP_des_ede_cfb(3ssl), EVP_des_ede_cfb(3ssl), EVP_des_ede_cfb(3ssl), EVP_des_ede_cfb(3ssl), EVP_des_ede_ofb(3ssl), EVP_des_ede_ofb(3ssl), EVP_des_ede_ofb(3ssl), EVP_des_ede_ofb(3ssl), EVP_des_ede_ofb(3ssl), EVP_des_ede_ofb(3ssl), EVP_des_ede_ofb(3ssl), EVP_des_ofb(3ssl), EVP_des_ofb(3ssl), EVP_des_ofb(3ssl), EVP_des_ofb(3ssl), EVP_des_ofb(3ssl), EVP_des_ofb(3ssl), EVP_des_ofb(3ssl), EVP_EncryptFinal(3ssl), EVP_EncryptFinal(3ssl), EVP_EncryptFinal(3ssl), EVP_EncryptFinal(3ssl), EVP_EncryptFinal(3ssl), EVP_EncryptFinal(3ssl), EVP_EncryptFinal(3ssl), EVP_EncryptFinal_ex(3ssl), EVP_EncryptFinal_ex(3ssl), EVP_EncryptFinal_ex(3ssl), EVP_EncryptFinal_ex(3ssl), EVP_EncryptFinal_ex(3ssl), EVP_EncryptFinal_ex(3ssl), EVP_EncryptFinal_ex(3ssl), EVP_EncryptInit_ex(3ssl), EVP_EncryptInit_ex(3ssl), EVP_EncryptInit_ex(3ssl), EVP_EncryptInit_ex(3ssl), EVP_EncryptInit_ex(3ssl), EVP_EncryptInit_ex(3ssl), EVP_EncryptInit_ex(3ssl), EVP_EncryptUpdate(3ssl), EVP_EncryptUpdate(3ssl), EVP_EncryptUpdate(3ssl), EVP_EncryptUpdate(3ssl), EVP_EncryptUpdate(3ssl), EVP_EncryptUpdate(3ssl), EVP_EncryptUpdate(3ssl), EVP_enc_null(3ssl), EVP_enc_null(3ssl), EVP_enc_null(3ssl), EVP_enc_null(3ssl), EVP_enc_null(3ssl), EVP_enc_null(3ssl), EVP_enc_null(3ssl), EVP_get_cipherbyname(3ssl), EVP_get_cipherbyname(3ssl), EVP_get_cipherbyname(3ssl), EVP_get_cipherbyname(3ssl), EVP_get_cipherbyname(3ssl), EVP_get_cipherbyname(3ssl), EVP_get_cipherbyname(3ssl), EVP_get_cipherbynid(3ssl), EVP_get_cipherbynid(3ssl), EVP_get_cipherbynid(3ssl), EVP_get_cipherbynid(3ssl), EVP_get_cipherbynid(3ssl), EVP_get_cipherbynid(3ssl), EVP_get_cipherbynid(3ssl), EVP_get_cipherbyobj(3ssl), EVP_get_cipherbyobj(3ssl), EVP_get_cipherbyobj(3ssl), EVP_get_cipherbyobj(3ssl), EVP_get_cipherbyobj(3ssl), EVP_get_cipherbyobj(3ssl), EVP_get_cipherbyobj(3ssl), EVP_idea_cbc(3ssl), EVP_idea_cbc(3ssl), EVP_idea_cbc(3ssl), EVP_idea_cbc(3ssl), EVP_idea_cbc(3ssl), EVP_idea_cbc(3ssl), EVP_idea_cbc(3ssl), EVP_idea_cfb(3ssl), EVP_idea_cfb(3ssl), EVP_idea_cfb(3ssl), EVP_idea_cfb(3ssl), EVP_idea_cfb(3ssl), EVP_idea_cfb(3ssl), EVP_idea_cfb(3ssl), EVP_idea_ecb(3ssl), EVP_idea_ecb(3ssl), EVP_idea_ecb(3ssl), EVP_idea_ecb(3ssl), EVP_idea_ecb(3ssl), EVP_idea_ecb(3ssl), EVP_idea_ecb(3ssl), EVP_idea_ofb(3ssl), EVP_idea_ofb(3ssl), EVP_idea_ofb(3ssl), EVP_idea_ofb(3ssl), EVP_idea_ofb(3ssl), EVP_idea_ofb(3ssl), EVP_idea_ofb(3ssl), EVP_rc2_40_cbc(3ssl), EVP_rc2_40_cbc(3ssl), EVP_rc2_40_cbc(3ssl), EVP_rc2_40_cbc(3ssl), EVP_rc2_40_cbc(3ssl), EVP_rc2_40_cbc(3ssl), EVP_rc2_40_cbc(3ssl), EVP_rc2_64_cbc(3ssl), EVP_rc2_64_cbc(3ssl), EVP_rc2_64_cbc(3ssl), EVP_rc2_64_cbc(3ssl), EVP_rc2_64_cbc(3ssl), EVP_rc2_64_cbc(3ssl), EVP_rc2_64_cbc(3ssl), EVP_rc2_cbc(3ssl), EVP_rc2_cbc(3ssl), EVP_rc2_cbc(3ssl), EVP_rc2_cbc(3ssl), EVP_rc2_cbc(3ssl), EVP_rc2_cbc(3ssl), EVP_rc2_cbc(3ssl), EVP_rc2_cfb(3ssl), EVP_rc2_cfb(3ssl), EVP_rc2_cfb(3ssl), EVP_rc2_cfb(3ssl), EVP_rc2_cfb(3ssl), EVP_rc2_cfb(3ssl), EVP_rc2_cfb(3ssl), EVP_rc2_ecb(3ssl), EVP_rc2_ecb(3ssl), EVP_rc2_ecb(3ssl), EVP_rc2_ecb(3ssl), EVP_rc2_ecb(3ssl), EVP_rc2_ecb(3ssl), EVP_rc2_ecb(3ssl), EVP_rc2_ofb(3ssl), EVP_rc2_ofb(3ssl), EVP_rc2_ofb(3ssl), EVP_rc2_ofb(3ssl), EVP_rc2_ofb(3ssl), EVP_rc2_ofb(3ssl), EVP_rc2_ofb(3ssl), EVP_rc4(3ssl), EVP_rc4(3ssl), EVP_rc4(3ssl), EVP_rc4(3ssl), EVP_rc4(3ssl), EVP_rc4(3ssl), EVP_rc4(3ssl), EVP_rc4_40(3ssl), EVP_rc4_40(3ssl), EVP_rc4_40(3ssl), EVP_rc4_40(3ssl), EVP_rc4_40(3ssl), EVP_rc4_40(3ssl), EVP_rc4_40(3ssl), EVP_rc4_hmac_md5(3ssl), EVP_rc4_hmac_md5(3ssl), EVP_rc4_hmac_md5(3ssl), EVP_rc4_hmac_md5(3ssl), EVP_rc4_hmac_md5(3ssl), EVP_rc4_hmac_md5(3ssl), EVP_rc5_32_12_16_cbc(3ssl), EVP_rc5_32_12_16_cbc(3ssl), EVP_rc5_32_12_16_cbc(3ssl), EVP_rc5_32_12_16_cbc(3ssl), EVP_rc5_32_12_16_cbc(3ssl), EVP_rc5_32_12_16_cbc(3ssl), EVP_rc5_32_12_16_cbc(3ssl), EVP_rc5_32_12_16_cfb(3ssl), EVP_rc5_32_12_16_cfb(3ssl), EVP_rc5_32_12_16_cfb(3ssl), EVP_rc5_32_12_16_cfb(3ssl), EVP_rc5_32_12_16_cfb(3ssl), EVP_rc5_32_12_16_cfb(3ssl), EVP_rc5_32_12_16_cfb(3ssl), EVP_rc5_32_12_16_ecb(3ssl), EVP_rc5_32_12_16_ecb(3ssl), EVP_rc5_32_12_16_ecb(3ssl), EVP_rc5_32_12_16_ecb(3ssl), EVP_rc5_32_12_16_ecb(3ssl), EVP_rc5_32_12_16_ecb(3ssl), EVP_rc5_32_12_16_ecb(3ssl), EVP_rc5_32_12_16_ofb(3ssl), EVP_rc5_32_12_16_ofb(3ssl), EVP_rc5_32_12_16_ofb(3ssl), EVP_rc5_32_12_16_ofb(3ssl), EVP_rc5_32_12_16_ofb(3ssl), EVP_rc5_32_12_16_ofb(3ssl), EVP_rc5_32_12_16_ofb(3ssl)

libssl-doc

Secure Sockets Layer toolkit - development documentation

openssl

Utilities from the general purpose cryptography library with TLS implementation

openssl-devel

Files for development of applications which will use OpenSSL

compat-openssl10-devel

Files for development of applications which have to use OpenSSL-1.0.2
EVP_CIPHER_CTX_new, EVP_CIPHER_CTX_reset, EVP_CIPHER_CTX_free, EVP_EncryptInit_ex, EVP_EncryptUpdate, EVP_EncryptFinal_ex, EVP_DecryptInit_ex, EVP_DecryptUpdate, EVP_DecryptFinal_ex, EVP_CipherInit_ex, EVP_CipherUpdate, EVP_CipherFinal_ex, EVP_CIPHER_CTX_set_key_length, EVP_CIPHER_CTX_ctrl, EVP_EncryptInit, EVP_EncryptFinal, EVP_DecryptInit, EVP_DecryptFinal, EVP_CipherInit, EVP_CipherFinal, EVP_get_cipherbyname, EVP_get_cipherbynid, EVP_get_cipherbyobj, EVP_CIPHER_nid, EVP_CIPHER_block_size, EVP_CIPHER_key_length, EVP_CIPHER_iv_length, EVP_CIPHER_flags, EVP_CIPHER_mode, EVP_CIPHER_type, EVP_CIPHER_CTX_cipher, EVP_CIPHER_CTX_nid, EVP_CIPHER_CTX_block_size, EVP_CIPHER_CTX_key_length, EVP_CIPHER_CTX_iv_length, EVP_CIPHER_CTX_get_app_data, EVP_CIPHER_CTX_set_app_data, EVP_CIPHER_CTX_type, EVP_CIPHER_CTX_flags, EVP_CIPHER_CTX_mode, EVP_CIPHER_param_to_asn1, EVP_CIPHER_asn1_to_param, EVP_CIPHER_CTX_set_padding, EVP_enc_null - EVP cipher routines
The EVP cipher routines are a high level interface to certain symmetric ciphers.
EVP_CIPHER_CTX_free() clears all information from a cipher context and free up any allocated memory associate with it, including ctx itself. This function should be called after all operations using a cipher are complete so sensitive information does not remain in memory.
EVP_EncryptInit_ex() sets up cipher context ctx for encryption with cipher type from ENGINEimpl. ctx must be created before calling this function. type is normally supplied by a function such as EVP_aes_256_cbc(). If impl is NULL then the default implementation is used. key is the symmetric key to use and iv is the IV to use (if necessary), the actual number of bytes used for the key and IV depends on the cipher. It is possible to set all parameters to NULL except type in an initial call and supply the remaining parameters in subsequent calls, all of which have type set to NULL. This is done when the default cipher parameters are not appropriate.
EVP_EncryptUpdate() encrypts inl bytes from the buffer in and writes the encrypted version to out. This function can be called multiple times to encrypt successive blocks of data. The amount of data written depends on the block alignment of the encrypted data: as a result the amount of data written may be anything from zero bytes to (inl + cipher_block_size - 1) so out should contain sufficient room. The actual number of bytes written is placed in outl. It also checks if in and out are partially overlapping, and if they are 0 is returned to indicate failure.
If padding is enabled (the default) then EVP_EncryptFinal_ex() encrypts the final data, that is any data that remains in a partial block. It uses standard block padding (aka PKCS padding) as described in the NOTES section, below. The encrypted final data is written to out which should have sufficient space for one cipher block. The number of bytes written is placed in outl. After this function is called the encryption operation is finished and no further calls to EVP_EncryptUpdate() should be made.
If padding is disabled then EVP_EncryptFinal_ex() will not encrypt any more data and it will return an error if any data remains in a partial block: that is if the total data length is not a multiple of the block size.
EVP_DecryptInit_ex(), EVP_DecryptUpdate() and EVP_DecryptFinal_ex() are the corresponding decryption operations. EVP_DecryptFinal() will return an error code if padding is enabled and the final block is not correctly formatted. The parameters and restrictions are identical to the encryption operations except that if padding is enabled the decrypted data buffer out passed to EVP_DecryptUpdate() should have sufficient room for (inl + cipher_block_size) bytes unless the cipher block size is 1 in which case inl bytes is sufficient.
EVP_CipherInit_ex(), EVP_CipherUpdate() and EVP_CipherFinal_ex() are functions that can be used for decryption or encryption. The operation performed depends on the value of the enc parameter. It should be set to 1 for encryption, 0 for decryption and -1 to leave the value unchanged (the actual value of ’enc’ being supplied in a previous call).
EVP_CIPHER_CTX_reset() clears all information from a cipher context and free up any allocated memory associate with it, except the ctx itself. This function should be called anytime ctx is to be reused for another EVP_CipherInit() / EVP_CipherUpdate() / EVP_CipherFinal() series of calls.
EVP_EncryptInit(), EVP_DecryptInit() and EVP_CipherInit() behave in a similar way to EVP_EncryptInit_ex(), EVP_DecryptInit_ex() and EVP_CipherInit_ex() except they always use the default cipher implementation.
EVP_EncryptFinal(), EVP_DecryptFinal() and EVP_CipherFinal() are identical to EVP_EncryptFinal_ex(), EVP_DecryptFinal_ex() and EVP_CipherFinal_ex(). In previous releases they also cleaned up the ctx, but this is no longer done and EVP_CIPHER_CTX_clean() must be called to free any context resources.
EVP_get_cipherbyname(), EVP_get_cipherbynid() and EVP_get_cipherbyobj() return an EVP_CIPHER structure when passed a cipher name, a NID or an ASN1_OBJECT structure.
EVP_CIPHER_nid() and EVP_CIPHER_CTX_nid() return the NID of a cipher when passed an EVP_CIPHER or EVP_CIPHER_CTX structure. The actual NID value is an internal value which may not have a corresponding OBJECT IDENTIFIER.
EVP_CIPHER_CTX_set_padding() enables or disables padding. This function should be called after the context is set up for encryption or decryption with EVP_EncryptInit_ex(), EVP_DecryptInit_ex() or EVP_CipherInit_ex(). By default encryption operations are padded using standard block padding and the padding is checked and removed when decrypting. If the pad parameter is zero then no padding is performed, the total amount of data encrypted or decrypted must then be a multiple of the block size or an error will occur.
Example
EVP_CIPHER_key_length() and EVP_CIPHER_CTX_key_length() return the key length of a cipher when passed an EVP_CIPHER or EVP_CIPHER_CTX structure. The constant EVP_MAX_KEY_LENGTH is the maximum key length for all ciphers. Note: although EVP_CIPHER_key_length() is fixed for a given cipher, the value of EVP_CIPHER_CTX_key_length() may be different for variable key length ciphers.
EVP_CIPHER_CTX_set_key_length() sets the key length of the cipher ctx. If the cipher is a fixed length cipher then attempting to set the key length to any value other than the fixed value is an error.
EVP_CIPHER_iv_length() and EVP_CIPHER_CTX_iv_length() return the IV length of a cipher when passed an EVP_CIPHER or EVP_CIPHER_CTX. It will return zero if the cipher does not use an IV. The constant EVP_MAX_IV_LENGTH is the maximum IV length for all ciphers.
EVP_CIPHER_block_size() and EVP_CIPHER_CTX_block_size() return the block size of a cipher when passed an EVP_CIPHER or EVP_CIPHER_CTX structure. The constant EVP_MAX_BLOCK_LENGTH is also the maximum block length for all ciphers.
EVP_CIPHER_type() and EVP_CIPHER_CTX_type() return the type of the passed cipher or context. This type is the actual NID of the cipher OBJECT IDENTIFIER as such it ignores the cipher parameters and 40 bit RC2 and 128 bit RC2 have the same NID. If the cipher does not have an object identifier or does not have ASN1 support this function will return NID_undef.
EVP_CIPHER_CTX_cipher() returns the EVP_CIPHER structure when passed an EVP_CIPHER_CTX structure.
EVP_CIPHER_mode() and EVP_CIPHER_CTX_mode() return the block cipher mode: EVP_CIPH_ECB_MODE, EVP_CIPH_CBC_MODE, EVP_CIPH_CFB_MODE, EVP_CIPH_OFB_MODE, EVP_CIPH_CTR_MODE, EVP_CIPH_GCM_MODE, EVP_CIPH_CCM_MODE, EVP_CIPH_XTS_MODE, EVP_CIPH_WRAP_MODE or EVP_CIPH_OCB_MODE. If the cipher is a stream cipher then EVP_CIPH_STREAM_CIPHER is returned.
EVP_CIPHER_param_to_asn1() sets the AlgorithmIdentifier parameter based on the passed cipher. This will typically include any parameters and an IV. The cipher IV (if any) must be set when this call is made. This call should be made before the cipher is actually used (before any EVP_EncryptUpdate(), EVP_DecryptUpdate() calls for example). This function may fail if the cipher does not have any ASN1 support.
EVP_CIPHER_asn1_to_param() sets the cipher parameters based on an ASN1 AlgorithmIdentifier parameter. The precise effect depends on the cipher In the case of RC2, for example, it will set the IV and effective key length. This function should be called after the base cipher type is set but before the key is set. For example EVP_CipherInit() will be called with the IV and key set to NULL,EVP_CIPHER_asn1_to_param() will be called and finally EVP_CipherInit() again with all parameters except the key set to NULL. It is possible for this function to fail if the cipher does not have any ASN1 support or the parameters cannot be set (for example the RC2 effective key length is not supported.
EVP_CIPHER_CTX_ctrl() allows various cipher specific parameters to be determined and set.
EVP_CIPHER_CTX_rand_key() generates a random key of the appropriate length based on the cipher context. The EVP_CIPHER can provide its own random key generation routine to support keys of a specific form. Key must point to a buffer at least as big as the value returned by EVP_CIPHER_CTX_key_length().
EVP_CIPHER_CTX_new() returns a pointer to a newly created EVP_CIPHER_CTX for success and NULL for failure.
EVP_EncryptInit_ex(), EVP_EncryptUpdate() and EVP_EncryptFinal_ex() return 1 for success and 0 for failure.
EVP_DecryptInit_ex() and EVP_DecryptUpdate() return 1 for success and 0 for failure. EVP_DecryptFinal_ex() returns 0 if the decrypt failed or 1 for success.
EVP_CipherInit_ex() and EVP_CipherUpdate() return 1 for success and 0 for failure. EVP_CipherFinal_ex() returns 0 for a decryption failure or 1 for success.
EVP_CIPHER_CTX_reset() returns 1 for success and 0 for failure.
EVP_get_cipherbyname(), EVP_get_cipherbynid() and EVP_get_cipherbyobj() return an EVP_CIPHER structure or NULL on error.
EVP_CIPHER_nid() and EVP_CIPHER_CTX_nid() return a NID.
EVP_CIPHER_block_size() and EVP_CIPHER_CTX_block_size() return the block size.
EVP_CIPHER_key_length() and EVP_CIPHER_CTX_key_length() return the key length.
EVP_CIPHER_iv_length() and EVP_CIPHER_CTX_iv_length() return the IV length or zero if the cipher does not use an IV.
EVP_CIPHER_type() and EVP_CIPHER_CTX_type() return the NID of the cipher’s OBJECT IDENTIFIER or NID_undef if it has no defined OBJECT IDENTIFIER.
EVP_CIPHER_CTX_cipher() returns an EVP_CIPHER structure.
EVP_CIPHER_param_to_asn1() and EVP_CIPHER_asn1_to_param() return greater than zero for success and zero or a negative number on failure.
All algorithms have a fixed key length unless otherwise stated.
Refer to SEE ALSO for the full list of ciphers available through the EVP interface.
EVP_enc_null()Null cipher: does nothing.
The EVP interface for Authenticated Encryption with Associated Data (AEAD) modes are subtly altered and several additional ctrl operations are supported depending on the mode specified.
To specify additional authenticated data (AAD), a call to EVP_CipherUpdate(), EVP_EncryptUpdate() or EVP_DecryptUpdate() should be made with the output parameter out set to NULL.
When decrypting, the return value of EVP_DecryptFinal() or EVP_CipherFinal() indicates whether the operation was successful. If it does not indicate success, the authentication operation has failed and any output data MUST NOT be used as it is corrupted.

GCM and OCB Modes

The following ctrls are supported in GCM and OCB modes.
EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_IVLEN, ivlen, NULL)Sets the IV length. This call can only be made before specifying an IV. If not called a default IV length is used.
For GCM AES and OCB AES the default is 12 (i.e. 96 bits). For OCB mode the maximum is 15.
EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_GET_TAG, taglen, tag)Writes taglen bytes of the tag value to the buffer indicated by tag. This call can only be made when encrypting data and after all data has been processed (e.g. after an EVP_EncryptFinal() call).
For OCB,taglen must either be 16 or the value previously set via EVP_CTRL_AEAD_SET_TAG.
EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG, taglen, tag)Sets the expected tag to taglen bytes from tag. The tag length can only be set before specifying an IV.taglen must be between 1 and 16 inclusive.
For GCM, this call is only valid when decrypting data.
For OCB, this call is valid when decrypting data to set the expected tag, and before encryption to set the desired tag length.
In OCB mode, calling this before encryption with tag set to NULL sets the tag length. If this is not called prior to encryption, a default tag length is used.
For OCB AES, the default tag length is 16 (i.e. 128 bits). It is also the maximum tag length for OCB.

CCM Mode

The EVP interface for CCM mode is similar to that of the GCM mode but with a few additional requirements and different ctrl values.
For CCM mode, the total plaintext or ciphertext length MUST be passed to EVP_CipherUpdate(), EVP_EncryptUpdate() or EVP_DecryptUpdate() with the output and input parameters (in and out) set to NULL and the length passed in the inl parameter.
EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG, taglen, tag)This call is made to set the expected CCM tag value when decrypting or the length of the tag (with the tag parameter set to NULL) when encrypting. The tag length is often referred to as M. If not set a default value is used (12 for AES). When decrypting, the tag needs to be set before passing in data to be decrypted, but as in GCM and OCB mode, it can be set after passing additional authenticated data (see AEAD Interface).
EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_CCM_SET_L, ivlen, NULL)Sets the CCML value. If not set a default is used (8 for AES).
EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_IVLEN, ivlen, NULL)Sets the CCM nonce (IV) length. This call can only be made before specifying an nonce value. The nonce length is given by 15 - L so it is 7 by default for AES.

ChaCha20-Poly1305

The following ctrls are supported for the ChaCha20-Poly1305 AEAD algorithm.
EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_IVLEN, ivlen, NULL)Sets the nonce length. This call can only be made before specifying the nonce. If not called a default nonce length of 12 (i.e. 96 bits) is used. The maximum nonce length is 12 bytes (i.e. 96-bits). If a nonce of less than 12 bytes is set then the nonce is automatically padded with leading 0 bytes to make it 12 bytes in length.
EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_GET_TAG, taglen, tag)Writes taglen bytes of the tag value to the buffer indicated by tag. This call can only be made when encrypting data and after all data has been processed (e.g. after an EVP_EncryptFinal() call).
taglen specified here must be 16 (POLY1305_BLOCK_SIZE, i.e. 128-bits) or less.
EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG, taglen, tag)Sets the expected tag to taglen bytes from tag. The tag length can only be set before specifying an IV.taglen must be between 1 and 16 (POLY1305_BLOCK_SIZE) inclusive. This call is only valid when decrypting data.
Where possible the EVP interface to symmetric ciphers should be used in preference to the low level interfaces. This is because the code then becomes transparent to the cipher used and much more flexible. Additionally, the EVP interface will ensure the use of platform specific cryptographic acceleration such as AES-NI (the low level interfaces do not provide the guarantee).
PKCS padding works by adding n padding bytes of value n to make the total length of the encrypted data a multiple of the block size. Padding is always added so if the data is already a multiple of the block size n will equal the block size. For example if the block size is 8 and 11 bytes are to be encrypted then 5 padding bytes of value 5 will be added.
When decrypting the final block is checked to see if it has the correct form.
Although the decryption operation can produce an error if padding is enabled, it is not a strong test that the input data or key is correct. A random block has better than 1 in 256 chance of being of the correct format and problems with the input data earlier on will not produce a final decrypt error.
If padding is disabled then the decryption operation will always succeed if the total amount of data decrypted is a multiple of the block size.

Openssl Evp_encryptinit_ex Example

The functions EVP_EncryptInit(), EVP_EncryptFinal(), EVP_DecryptInit(), EVP_CipherInit() and EVP_CipherFinal() are obsolete but are retained for compatibility with existing code. New code should use EVP_EncryptInit_ex(), EVP_EncryptFinal_ex(), EVP_DecryptInit_ex(), EVP_DecryptFinal_ex(), EVP_CipherInit_ex() and EVP_CipherFinal_ex() because they can reuse an existing context without allocating and freeing it up on each call.
There are some differences between functions EVP_CipherInit() and EVP_CipherInit_ex(), significant in some circumstances. EVP_CipherInit() fills the passed context object with zeros. As a consequence, EVP_CipherInit() does not allow step-by-step initialization of the ctx when the key and iv are passed in separate calls. It also means that the flags set for the CTX are removed, and it is especially important for the EVP_CIPHER_CTX_FLAG_WRAP_ALLOW flag treated specially in EVP_CipherInit_ex().
EVP_get_cipherbynid(), and EVP_get_cipherbyobj() are implemented as macros.
EVP_MAX_KEY_LENGTH and EVP_MAX_IV_LENGTH only refer to the internal ciphers with default key lengths. If custom ciphers exceed these values the results are unpredictable. This is because it has become standard practice to define a generic key as a fixed unsigned char array containing EVP_MAX_KEY_LENGTH bytes.
The ASN1 code is incomplete (and sometimes inaccurate) it has only been tested for certain common S/MIME ciphers (RC2, DES, triple DES) in CBC mode.
Encrypt a string using IDEA:
The ciphertext from the above example can be decrypted using the openssl utility with the command line (shown on two lines for clarity):
General encryption and decryption function example using FILE I/O and AES128 with a 128-bit key:
evp(7)
EVP_aes(3), EVP_aria(3), EVP_bf(3), EVP_camellia(3), EVP_cast5(3), EVP_chacha20(3), EVP_des(3), EVP_desx(3), EVP_idea(3), EVP_rc2(3), EVP_rc4(3), EVP_rc5(3), EVP_seed(3), EVP_sm4(3)
Support for OCB mode was added in OpenSSL 1.1.0.
EVP_CIPHER_CTX was made opaque in OpenSSL 1.1.0. As a result, EVP_CIPHER_CTX_reset() appeared and EVP_CIPHER_CTX_cleanup() disappeared. EVP_CIPHER_CTX_init() remains as an alias for EVP_CIPHER_CTX_reset().
Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (the License). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>.

Name

EVP_CIPHER_CTX_init, EVP_EncryptInit_ex, EVP_EncryptUpdate, EVP_EncryptFinal_ex, EVP_DecryptInit_ex, EVP_DecryptUpdate, EVP_DecryptFinal_ex,EVP_CipherInit_ex, EVP_CipherUpdate, EVP_CipherFinal_ex, EVP_CIPHER_CTX_set_key_length, EVP_CIPHER_CTX_ctrl, EVP_CIPHER_CTX_cleanup, EVP_EncryptInit,EVP_EncryptFinal, EVP_DecryptInit, EVP_DecryptFinal, EVP_CipherInit, EVP_CipherFinal, EVP_get_cipherbyname, EVP_get_cipherbynid, EVP_get_cipherbyobj,EVP_CIPHER_nid, EVP_CIPHER_block_size, EVP_CIPHER_key_length, EVP_CIPHER_iv_length, EVP_CIPHER_flags, EVP_CIPHER_mode, EVP_CIPHER_type, EVP_CIPHER_CTX_cipher,EVP_CIPHER_CTX_nid, EVP_CIPHER_CTX_block_size, EVP_CIPHER_CTX_key_length, EVP_CIPHER_CTX_iv_length, EVP_CIPHER_CTX_get_app_data, EVP_CIPHER_CTX_set_app_data,EVP_CIPHER_CTX_type, EVP_CIPHER_CTX_flags, EVP_CIPHER_CTX_mode, EVP_CIPHER_param_to_asn1, EVP_CIPHER_asn1_to_param, EVP_CIPHER_CTX_set_padding - EVP cipherroutines

Synopsis

Description

The EVP cipher routines are a high level interface to certain symmetric ciphers.

EVP_CIPHER_CTX_init() initializes cipher contex ctx.

EVP_EncryptInit_ex() sets up cipher context ctx for encryption with cipher type from ENGINEimpl. ctx mustbe initialized before calling this function. type is normally supplied by a function such as EVP_des_cbc(). If impl is NULLthen the default implementation is used. key is the symmetric key to use and iv is the IV to use (if necessary), the actual numberof bytes used for the key and IV depends on the cipher. It is possible to set all parameters to NULL except type in aninitial call and supply the remaining parameters in subsequent calls, all of which have type set to NULL . This is done when the defaultcipher parameters are not appropriate.

EVP_EncryptUpdate() encrypts inl bytes from the buffer in and writes the encrypted version to out. This function can be calledmultiple times to encrypt successive blocks of data. The amount of data written depends on the block alignment of the encrypted data: as a result the amount ofdata written may be anything from zero bytes to (inl + cipher_block_size - 1) so outl should contain sufficient room. The actual number of bytes writtenis placed in outl.

If padding is enabled (the default) then EVP_EncryptFinal_ex() encrypts the 'final' data, that is any data that remains in a partial block. It usesstandard block padding (aka PKCS padding). The encrypted final data is written to out which should have sufficient space for one cipherblock. The number of bytes written is placed in outl. After this function is called the encryption operation is finished and no further calls toEVP_EncryptUpdate() should be made.

If padding is disabled then EVP_EncryptFinal_ex() will not encrypt any more data and it will return an error if any data remains in a partial block:that is if the total data length is not a multiple of the block size.

EVP_DecryptInit_ex(), EVP_DecryptUpdate() and EVP_DecryptFinal_ex() are the corresponding decryption operations.EVP_DecryptFinal() will return an error code if padding is enabled and the final block is not correctly formatted. The parameters and restrictions areidentical to the encryption operations except that if padding is enabled the decrypted data buffer out passed to EVP_DecryptUpdate() should havesufficient room for (inl + cipher_block_size) bytes unless the cipher block size is 1 in which case inl bytes is sufficient.

EVP_CipherInit_ex(), EVP_CipherUpdate() and EVP_CipherFinal_ex() are functions that can be used for decryption or encryption. Theoperation performed depends on the value of the enc parameter. It should be set to 1 for encryption, 0 for decryption and -1 to leave the valueunchanged (the actual value of 'enc' being supplied in a previous call).

EVP_CIPHER_CTX_cleanup() clears all information from a cipher context and free up any allocated memory associate with it. It should be called afterall operations using a cipher are complete so sensitive information does not remain in memory.

EVP_EncryptInit(), EVP_DecryptInit() and EVP_CipherInit() behave in a similar way to EVP_EncryptInit_ex(), EVP_DecryptInit_exand EVP_CipherInit_ex() except the ctx paramter does not need to be initialized and they always use the default cipher implementation.

EVP_EncryptFinal(), EVP_DecryptFinal() and EVP_CipherFinal() behave in a similar way to EVP_EncryptFinal_ex(),EVP_DecryptFinal_ex() and EVP_CipherFinal_ex() except ctx is automatically cleaned up after the call.

EVP_get_cipherbyname(), EVP_get_cipherbynid() and EVP_get_cipherbyobj() return an EVP_CIPHER structure when passed acipher name, a NID or an ASN1_OBJECT structure.

EVP_CIPHER_nid() and EVP_CIPHER_CTX_nid() return the NID of a cipher when passed an EVP_CIPHER orEVP_CIPHER_CTX structure. The actual NID value is an internal value which may not have a corresponding OBJECTIDENTIFIER .

EVP_CIPHER_CTX_set_padding() enables or disables padding. By default encryption operations are padded using standard block padding and the padding ischecked and removed when decrypting. If the pad parameter is zero then no padding is performed, the total amount of data encrypted or decrypted mustthen be a multiple of the block size or an error will occur.

EVP_CIPHER_key_length() and EVP_CIPHER_CTX_key_length() return the key length of a cipher when passed an EVP_CIPHER orEVP_CIPHER_CTX structure. The constant EVP_MAX_KEY_LENGTH is the maximum key length for all ciphers. Note: althoughEVP_CIPHER_key_length() is fixed for a given cipher, the value of EVP_CIPHER_CTX_key_length() may be different for variable key length ciphers.

EVP_CIPHER_CTX_set_key_length() sets the key length of the cipher ctx. If the cipher is a fixed length cipher then attempting to set the key lengthto any value other than the fixed value is an error.

EVP_CIPHER_iv_length() and EVP_CIPHER_CTX_iv_length() return the IV length of a cipher when passed anEVP_CIPHER or EVP_CIPHER_CTX . It will return zero if the cipher does not use an IV . The constantEVP_MAX_IV_LENGTH is the maximum IV length for all ciphers.

EVP_CIPHER_block_size() and EVP_CIPHER_CTX_block_size() return the block size of a cipher when passed an EVP_CIPHER orEVP_CIPHER_CTX structure. The constant EVP_MAX_IV_LENGTH is also the maximum block length for all ciphers.

EVP_CIPHER_type() and EVP_CIPHER_CTX_type() return the type of the passed cipher or context. This 'type' is the actual NID ofthe cipher OBJECT IDENTIFIER as such it ignores the cipher parameters and 40 bit RC2 and 128 bit RC2 have the sameNID . If the cipher does not have an object identifier or does not have ASN1 support this function will return NID_undef.

EVP_CIPHER_CTX_cipher() returns the EVP_CIPHER structure when passed an EVP_CIPHER_CTX structure.

EVP_CIPHER_mode() and EVP_CIPHER_CTX_mode() return the block cipher mode: EVP_CIPH_ECB_MODE , EVP_CIPH_CBC_MODE, EVP_CIPH_CFB_MODE or EVP_CIPH_OFB_MODE . If the cipher is a stream cipher then EVP_CIPH_STREAM_CIPHER isreturned.

EVP_CIPHER_param_to_asn1() sets the AlgorithmIdentifier 'parameter' based on the passed cipher. This will typically include any parameters and anIV . The cipher IV (if any) must be set when this call is made. This call should be made before the cipher is actually 'used'(before any EVP_EncryptUpdate(), EVP_DecryptUpdate() calls for example). This function may fail if the cipher does not have anyASN1 support.

EVP_CIPHER_asn1_to_param() sets the cipher parameters based on an ASN1 AlgorithmIdentifier 'parameter'. The precise effect depends onthe cipher In the case of RC2 , for example, it will set the IV and effective key length. This function should be called afterthe base cipher type is set but before the key is set. For example EVP_CipherInit() will be called with the IV and key set toNULL , EVP_CIPHER_asn1_to_param() will be called and finally EVP_CipherInit() again with all parameters except the key set toNULL . It is possible for this function to fail if the cipher does not have any ASN1 support or the parameters cannot be set (forexample the RC2 effective key length is not supported.

EVP_CIPHER_CTX_ctrl() allows various cipher specific parameters to be determined and set. Currently only the RC2 effective key lengthand the number of rounds of RC5 can be set.

Return Values

EVP_EncryptInit_ex(), EVP_EncryptUpdate() and EVP_EncryptFinal_ex() return 1 for success and 0 for failure.

EVP_DecryptInit_ex() and EVP_DecryptUpdate() return 1 for success and 0 for failure. EVP_DecryptFinal_ex() returns 0 if the decryptfailed or 1 for success.

EVP_CipherInit_ex() and EVP_CipherUpdate() return 1 for success and 0 for failure. EVP_CipherFinal_ex() returns 0 for a decryptionfailure or 1 for success.

EVP_CIPHER_CTX_cleanup() returns 1 for success and 0 for failure.

EVP_get_cipherbyname(), EVP_get_cipherbynid() and EVP_get_cipherbyobj() return an EVP_CIPHER structure orNULL on error.

EVP_CIPHER_nid() and EVP_CIPHER_CTX_nid() return a NID .

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EVP_CIPHER_block_size() and EVP_CIPHER_CTX_block_size() return the block size.

EVP_CIPHER_key_length() and EVP_CIPHER_CTX_key_length() return the key length.

EVP_CIPHER_CTX_set_padding() always returns 1.

EVP_CIPHER_iv_length() and EVP_CIPHER_CTX_iv_length() return the IV length or zero if the cipher does not use anIV .

EVP_CIPHER_type() and EVP_CIPHER_CTX_type() return the NID of the cipher's OBJECT IDENTIFIER or NID_undef if ithas no defined OBJECT IDENTIFIER .

EVP_CIPHER_CTX_cipher() returns an EVP_CIPHER structure.

EVP_CIPHER_param_to_asn1() and EVP_CIPHER_asn1_to_param() return 1 for success or zero for failure.

Cipher Listing

All algorithms have a fixed key length unless otherwise stated.

EVP_rc2_40_cbc(void), EVP_rc2_64_cbc(void)
RC2 algorithm in CBC mode with a default key length and effective key length of 40 and 64 bits. These are obsolete and newcode should use EVP_rc2_cbc(), EVP_CIPHER_CTX_set_key_length() and EVP_CIPHER_CTX_ctrl() to set the key length and effective keylength.
EVP_bf_cbc(void), EVP_bf_ecb(void), EVP_bf_cfb(void), EVP_bf_ofb(void);
Blowfish encryption algorithm in CBC , ECB , CFB and OFB modes respectively. This is a variablekey length cipher.
EVP_cast5_cbc(void), EVP_cast5_ecb(void), EVP_cast5_cfb(void), EVP_cast5_ofb(void)
CAST encryption algorithm in CBC , ECB , CFB and OFB modes respectively. This isa variable key length cipher.
EVP_rc5_32_12_16_cbc(void), EVP_rc5_32_12_16_ecb(void), EVP_rc5_32_12_16_cfb(void), EVP_rc5_32_12_16_ofb(void)
RC5 encryption algorithm in CBC , ECB , CFB and OFB modes respectively. This is avariable key length cipher with an additional 'number of rounds' parameter. By default the key length is set to 128 bits and 12 rounds.

Notes

Where possible the EVP interface to symmetric ciphers should be used in preference to the low level interfaces. This is because thecode then becomes transparent to the cipher used and much more flexible.

PKCS padding works by adding n padding bytes of value n to make the total length of the encrypted data a multiple of the blocksize. Padding is always added so if the data is already a multiple of the block size n will equal the block size. For example if the block size is 8 and11 bytes are to be encrypted then 5 padding bytes of value 5 will be added.

When decrypting the final block is checked to see if it has the correct form.

Although the decryption operation can produce an error if padding is enabled, it is not a strong test that the input data or key is correct. A random blockhas better than 1 in 256 chance of being of the correct format and problems with the input data earlier on will not produce a final decrypt error.

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If padding is disabled then the decryption operation will always succeed if the total amount of data decrypted is a multiple of the block size.

The functions EVP_EncryptInit(), EVP_EncryptFinal(), EVP_DecryptInit(), EVP_CipherInit() and EVP_CipherFinal() areobsolete but are retained for compatibility with existing code. New code should use EVP_EncryptInit_ex(), EVP_EncryptFinal_ex(),EVP_DecryptInit_ex(), EVP_DecryptFinal_ex(), EVP_CipherInit_ex() and EVP_CipherFinal_ex() because they can reuse an existingcontext without allocating and freeing it up on each call.

Bugs

For RC5 the number of rounds can currently only be set to 8, 12 or 16. This is a limitation of the current RC5 code ratherthan the EVP interface.

EVP_MAX_KEY_LENGTH and EVP_MAX_IV_LENGTH only refer to the internal ciphers with default key lengths. If custom ciphers exceedthese values the results are unpredictable. This is because it has become standard practice to define a generic key as a fixed unsigned char array containingEVP_MAX_KEY_LENGTH bytes.

The ASN1 code is incomplete (and sometimes inaccurate) it has only been tested for certain common S/MIME ciphers ( RC2 ,DES , triple DES ) in CBC mode.

Examples

Get the number of rounds used in RC5:Get the RC2 effective key length:Set the number of rounds used in RC5:Set the effective key length used in RC2:Encrypt a string using blowfish:The ciphertext from the above example can be decrypted using the openssl utility with the command line:General encryption, decryption function example using FILE I/O and RC2 with an 80 bit key:

See Also

Evp_encryptinit_ex Example Text

evp(3)

Evp_encryptinit_ex Example Online

History

EVP_CIPHER_CTX_init(), EVP_EncryptInit_ex(), EVP_EncryptFinal_ex(), EVP_DecryptInit_ex(), EVP_DecryptFinal_ex(),EVP_CipherInit_ex(), EVP_CipherFinal_ex() and EVP_CIPHER_CTX_set_padding() appeared in OpenSSL 0.9.7.