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e9492d1cec
Two demos are provided: one using RSA-PSS directly in which a digest must be provided, and one using RSA-PSS with the EVP_DigestSign APIs which performs the hashing for you. Fixes #14113. Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Paul Dale <pauli@openssl.org> (Merged from https://github.com/openssl/openssl/pull/17800)
190 lines
5.3 KiB
C
190 lines
5.3 KiB
C
/*
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* Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <openssl/core_names.h>
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#include <openssl/evp.h>
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#include <openssl/rsa.h>
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#include <openssl/params.h>
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#include <openssl/err.h>
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#include <openssl/bio.h>
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#include "rsa_pss.h"
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/* The data to be signed. This will be hashed. */
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static const char test_message[] =
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"This is an example message to be signed.";
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/* A property query used for selecting algorithm implementations. */
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static const char *propq = NULL;
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/*
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* This function demonstrates RSA signing of an arbitrary-length message.
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* Hashing is performed automatically. In this example, SHA-256 is used. If you
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* have already hashed your message and simply want to sign the hash directly,
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* see rsa_pss_direct.c.
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*/
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static int sign(OSSL_LIB_CTX *libctx, unsigned char **sig, size_t *sig_len)
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{
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int rv = 0;
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EVP_PKEY *pkey = NULL;
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EVP_MD_CTX *mctx = NULL;
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OSSL_PARAM params[2], *p = params;
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const unsigned char *ppriv_key = NULL;
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*sig = NULL;
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/* Load DER-encoded RSA private key. */
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ppriv_key = rsa_priv_key;
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pkey = d2i_PrivateKey_ex(EVP_PKEY_RSA, NULL, &ppriv_key,
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sizeof(rsa_priv_key), libctx, propq);
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if (pkey == NULL) {
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fprintf(stderr, "Failed to load private key\n");
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goto end;
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}
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/* Create MD context used for signing. */
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mctx = EVP_MD_CTX_new();
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if (mctx == NULL) {
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fprintf(stderr, "Failed to create MD context\n");
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goto end;
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}
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/* Initialize MD context for signing. */
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*p++ = OSSL_PARAM_construct_utf8_string(OSSL_SIGNATURE_PARAM_PAD_MODE,
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OSSL_PKEY_RSA_PAD_MODE_PSS, 0);
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*p = OSSL_PARAM_construct_end();
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if (EVP_DigestSignInit_ex(mctx, NULL, "SHA256", libctx, propq,
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pkey, params) == 0) {
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fprintf(stderr, "Failed to initialize signing context\n");
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goto end;
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}
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/*
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* Feed data to be signed into the algorithm. This may
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* be called multiple times.
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*/
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if (EVP_DigestSignUpdate(mctx, test_message, sizeof(test_message)) == 0) {
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fprintf(stderr, "Failed to hash message into signing context\n");
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goto end;
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}
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/* Determine signature length. */
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if (EVP_DigestSignFinal(mctx, NULL, sig_len) == 0) {
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fprintf(stderr, "Failed to get signature length\n");
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goto end;
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}
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/* Allocate memory for signature. */
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*sig = OPENSSL_malloc(*sig_len);
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if (*sig == NULL) {
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fprintf(stderr, "Failed to allocate memory for signature\n");
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goto end;
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}
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/* Generate signature. */
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if (EVP_DigestSignFinal(mctx, *sig, sig_len) == 0) {
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fprintf(stderr, "Failed to sign\n");
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goto end;
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}
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rv = 1;
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end:
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EVP_MD_CTX_free(mctx);
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EVP_PKEY_free(pkey);
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if (rv == 0)
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OPENSSL_free(*sig);
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return rv;
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}
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/*
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* This function demonstrates verification of an RSA signature over an
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* arbitrary-length message using the PSS signature scheme. Hashing is performed
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* automatically.
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*/
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static int verify(OSSL_LIB_CTX *libctx, const unsigned char *sig, size_t sig_len)
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{
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int rv = 0;
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EVP_PKEY *pkey = NULL;
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EVP_MD_CTX *mctx = NULL;
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OSSL_PARAM params[2], *p = params;
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const unsigned char *ppub_key = NULL;
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/* Load DER-encoded RSA public key. */
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ppub_key = rsa_pub_key;
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pkey = d2i_PublicKey(EVP_PKEY_RSA, NULL, &ppub_key, sizeof(rsa_pub_key));
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if (pkey == NULL) {
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fprintf(stderr, "Failed to load public key\n");
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goto end;
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}
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/* Create MD context used for verification. */
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mctx = EVP_MD_CTX_new();
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if (mctx == NULL) {
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fprintf(stderr, "Failed to create MD context\n");
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goto end;
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}
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/* Initialize MD context for verification. */
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*p++ = OSSL_PARAM_construct_utf8_string(OSSL_SIGNATURE_PARAM_PAD_MODE,
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OSSL_PKEY_RSA_PAD_MODE_PSS, 0);
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*p = OSSL_PARAM_construct_end();
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if (EVP_DigestVerifyInit_ex(mctx, NULL, "SHA256", libctx, propq,
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pkey, params) == 0) {
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fprintf(stderr, "Failed to initialize signing context\n");
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goto end;
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}
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/*
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* Feed data to be signed into the algorithm. This may
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* be called multiple times.
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*/
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if (EVP_DigestVerifyUpdate(mctx, test_message, sizeof(test_message)) == 0) {
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fprintf(stderr, "Failed to hash message into signing context\n");
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goto end;
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}
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/* Verify signature. */
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if (EVP_DigestVerifyFinal(mctx, sig, sig_len) == 0) {
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fprintf(stderr, "Failed to verify signature; "
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"signature may be invalid\n");
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goto end;
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}
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rv = 1;
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end:
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EVP_MD_CTX_free(mctx);
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EVP_PKEY_free(pkey);
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return rv;
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}
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int main(int argc, char **argv)
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{
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int rv = 1;
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OSSL_LIB_CTX *libctx = NULL;
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unsigned char *sig = NULL;
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size_t sig_len = 0;
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if (sign(libctx, &sig, &sig_len) == 0)
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goto end;
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if (verify(libctx, sig, sig_len) == 0)
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goto end;
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rv = 0;
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end:
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OPENSSL_free(sig);
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OSSL_LIB_CTX_free(libctx);
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return rv;
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}
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