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Manpages RSA_signSection: OpenSSL (3ssl)Updated: 0.9.6c Index Return to Main Contents NAMERSA_sign, RSA_verify - RSA signaturesSYNOPSIS
#include <openssl/rsa.h> int RSA_sign(int type, unsigned char *m, unsigned int m_len, unsigned char *sigret, unsigned int *siglen, RSA *rsa); int RSA_verify(int type, unsigned char *m, unsigned int m_len, unsigned char *sigbuf, unsigned int siglen, RSA *rsa); DESCRIPTIONRSA_sign() signs the message digest m of size m_len using the private key rsa as specified in PKCS #1 v2.0. It stores the signature in sigret and the signature size in siglen. sigret must point to RSA_size(rsa) bytes of memory.type denotes the message digest algorithm that was used to generate m. It usually is one of NID_sha1, NID_ripemd160 and NID_md5; see objects(3) for details. If type is NID_md5_sha1, an SSL signature (MD5 and SHA1 message digests with PKCS #1 padding and no algorithm identifier) is created. RSA_verify() verifies that the signature sigbuf of size siglen matches a given message digest m of size m_len. type denotes the message digest algorithm that was used to generate the signature. rsa is the signer's public key. RETURN VALUESRSA_sign() returns 1 on success, 0 otherwise. RSA_verify() returns 1 on successful verification, 0 otherwise.The error codes can be obtained by ERR_get_error(3). BUGSCertain signatures with an improper algorithm identifier are accepted for compatibility with SSLeay 0.4.5 :-)CONFORMING TOSSL, PKCS #1 v2.0SEE ALSOerr(3), objects(3), rsa(3), RSA_private_encrypt(3), RSA_public_decrypt(3)HISTORYRSA_sign() and RSA_verify() are available in all versions of SSLeay and OpenSSL.
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