RSA_SIGN_ASN1_OCTET_STRING(3) | Library Functions Manual | RSA_SIGN_ASN1_OCTET_STRING(3)

# NAME

`RSA_sign_ASN1_OCTET_STRING`, `RSA_verify_ASN1_OCTET_STRING` — RSA signatures

# SYNOPSIS

library “libcrypto”
`#include <openssl/rsa.h>`

int
`RSA_sign_ASN1_OCTET_STRING`(int dummy, unsigned char *m, unsigned int m_len, unsigned char *sigret, unsigned int *siglen, RSA *rsa);

int
`RSA_verify_ASN1_OCTET_STRING`(int dummy, unsigned char *m, unsigned int m_len, unsigned char *sigbuf, unsigned int siglen, RSA *rsa);

# DESCRIPTION

`RSA_sign_ASN1_OCTET_STRING`() signs the octet string m of size m_len using the private key rsa represented in DER using PKCS #1 padding. It stores the signature in sigret and the signature size in siglen. sigret must point to `RSA_size`(rsa) bytes of memory.

dummy is ignored.

`RSA_verify_ASN1_OCTET_STRING`() verifies that the signature sigbuf of size siglen is the DER representation of a given octet string m of size m_len. dummy is ignored. rsa is the signer's public key.

# RETURN VALUES

`RSA_sign_ASN1_OCTET_STRING`() returns 1 on success or 0 otherwise. `RSA_verify_ASN1_OCTET_STRING`() returns 1 on successful verification or 0 otherwise.

The error codes can be obtained by ERR_get_error(3).

# SEE ALSO

RSA_new(3), RSA_sign(3), RSA_verify(3)

# HISTORY

`RSA_sign_ASN1_OCTET_STRING`() and `RSA_verify_ASN1_OCTET_STRING`() first appeared in SSLeay 0.8.0 and have been available since OpenBSD 2.4.

# BUGS

These functions serve no recognizable purpose.

June 8, 2025 | Debian