|BIO_F_CIPHER(3)||Library Functions Manual||BIO_F_CIPHER(3)|
const BIO_METHOD *
const EVP_CIPHER *cipher, unsigned
char *key, unsigned char *iv,
BIO_f_cipher() returns the cipher BIO method. This is a filter BIO that encrypts any data written through it, and decrypts any data read from it. It is a BIO wrapper for the cipher routines EVP_CipherInit(3), EVP_CipherUpdate(3), and EVP_CipherFinal(3).
BIO_flush(3) on an encryption BIO that is being written through is used to signal that no more data is to be encrypted: this is used to flush and possibly pad the final block through the BIO.
BIO_set_cipher() sets the cipher of BIO
b to cipher using key
key and IV iv.
enc should be set to 1 for encryption and zero for
When reading from an encryption BIO, the final block is
automatically decrypted and checked when EOF is detected.
BIO_get_cipher_status() is a
BIO_ctrl(3) macro which can be called
to determine whether the decryption operation was successful.
BIO_get_cipher_ctx() is a
BIO_ctrl(3) macro which retrieves the
internal BIO cipher context. The retrieved context can be used in
conjunction with the standard cipher routines to set it up. This is useful
BIO_set_cipher() is not flexible enough for the
When encrypting, BIO_flush(3) must be called to flush the final block through the BIO. If it is not, then the final block will fail a subsequent decrypt.
When decrypting, an error on the final block is signalled by a
zero return value from the read operation. A successful decrypt followed by
EOF will also return zero for the final read.
BIO_get_cipher_status() should be called to
determine if the decrypt was successful.
BIO_f_cipher() returns the cipher BIO method.
BIO_set_cipher() returns 1 on success and 0 on error.
BIO_get_cipher_status() returns 1 for a
successful decrypt and 0 for failure.
BIO_get_cipher_ctx() currently always
BIO_get_cipher_status() first appeared in SSLeay 0.6.5 and have been available since OpenBSD 2.4.
BIO_get_cipher_ctx() first appeared in
SSLeay 0.9.1 and has been available since OpenBSD
|June 6, 2019||OpenBSD-current|