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download PDF document: RSA_private_decrypt.3.pdf

RSA_PUBLIC_ENCRYPT(3ossl) OpenSSL RSA_PUBLIC_ENCRYPT(3ossl)

NAME RSA_public_encrypt, RSA_private_decrypt - RSA public key cryptography
SYNOPSIS #include <openssl/rsa.h>
The following functions have been deprecated since OpenSSL 3.0, and can be hidden entirely by defining OPENSSL_API_COMPAT with a suitable version value, see openssl_user_macros(7):
int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to, RSA *rsa, int padding);
int RSA_private_decrypt(int flen, const unsigned char *from, unsigned char *to, RSA *rsa, int padding);
DESCRIPTION Both of the functions described on this page are deprecated. Applications should instead use EVP_PKEY_encrypt_init_ex(3), EVP_PKEY_encrypt(3), EVP_PKEY_decrypt_init_ex(3) and EVP_PKEY_decrypt(3).
RSA_public_encrypt() encrypts the flen bytes at from (usually a session key) using the public key rsa and stores the ciphertext in to. to must point to RSA_size(rsa) bytes of memory.
padding denotes one of the following modes:
RSA_PKCS1_PADDING PKCS #1 v1.5 padding. This currently is the most widely used mode. However, it is highly recommended to use RSA_PKCS1_OAEP_PADDING in new applications. SEE WARNING BELOW.
RSA_PKCS1_OAEP_PADDING EME-OAEP as defined in PKCS #1 v2.0 with SHA-1, MGF1 and an empty encoding parameter. This mode is recommended for all new applications.
RSA_NO_PADDING Raw RSA encryption. This mode should only be used to implement cryptographically sound padding modes in the application code. Encrypting user data directly with RSA is insecure.
flen must not be more than RSA_size(rsa) - 11 for the PKCS #1 v1.5 based padding modes, not more than RSA_size(rsa) - 42 for RSA_PKCS1_OAEP_PADDING and exactly RSA_size(rsa) for RSA_NO_PADDING. When a padding mode other than RSA_NO_PADDING is in use, then RSA_public_encrypt() will include some random bytes into the ciphertext and therefore the ciphertext will be different each time, even if the plaintext and the public key are exactly identical. The returned ciphertext in to will always be zero padded to exactly RSA_size(rsa) bytes. to and from may overlap.
RSA_private_decrypt() decrypts the flen bytes at from using the private key rsa and stores the plaintext in to. flen should be equal to RSA_size(rsa) but may be smaller, when leading zero bytes are in the
RETURN VALUES RSA_public_encrypt() returns the size of the encrypted data (i.e., RSA_size(rsa)). RSA_private_decrypt() returns the size of the recovered plaintext. A return value of 0 is not an error and means only that the plaintext was empty.
On error, -1 is returned; the error codes can be obtained by ERR_get_error(3).
WARNINGS Decryption failures in the RSA_PKCS1_PADDING mode leak information which can potentially be used to mount a Bleichenbacher padding oracle attack. This is an inherent weakness in the PKCS #1 v1.5 padding design. Prefer RSA_PKCS1_OAEP_PADDING.
CONFORMING TO SSL, PKCS #1 v2.0
SEE ALSO ERR_get_error(3), RAND_bytes(3), RSA_size(3)
HISTORY Both of these functions were deprecated in OpenSSL 3.0.
COPYRIGHT Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (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>.
3.0.11 2023-09-19 RSA_PUBLIC_ENCRYPT(3ossl)