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RSA_sign(3)
NAME
  RSA_sign, RSA_verify - RSA signatures

SYNOPSIS
  #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 );

DESCRIPTION
  The RSA_sign() function 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. The sigret must point to
  RSA_size(rsa) bytes of memory.

  The 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.

  The RSA_verify() function verifies that the signature sigbuf of size siglen
  matches a given message digest m of size m_len. The type denotes the
  message digest algorithm that was used to generate the signature. The rsa
  is the signer's public key.

  These functions conform to SSL, PKCS #1 v2.0.

RESTRICTIONS
  Certain signatures with an improper algorithm identifier are accepted for
  compatibility with SSLeay 0.4.5.

RETURN VALUES
  The RSA_sign() function returns 1 on success, 0 otherwise.  The
  RSA_verify() function returns 1 on successful verification, 0 otherwise.

  The error codes can be obtained by using the ERR_get_error() function.

HISTORY
  The RSA_sign() and RSA_verify() functions are available in all versions of
  SSLeay and OpenSSL.

SEE ALSO
  Functions: err(3), objects(3), rsa(3), RSA_private_encrypt(3),
  RSA_public_decrypt(3)

Index for Section 3

Alphabetical listing for R

Top of page