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95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
/*
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* Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (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 "internal/cryptlib.h"
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#include <openssl/bn.h>
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#include <openssl/rsa.h>
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#include <openssl/objects.h>
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#include <openssl/x509.h>
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int RSA_sign_ASN1_OCTET_STRING(int type,
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const unsigned char *m, unsigned int m_len,
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unsigned char *sigret, unsigned int *siglen,
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RSA *rsa)
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{
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ASN1_OCTET_STRING sig;
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int i, j, ret = 1;
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unsigned char *p, *s;
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sig.type = V_ASN1_OCTET_STRING;
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sig.length = m_len;
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sig.data = (unsigned char *)m;
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i = i2d_ASN1_OCTET_STRING(&sig, NULL);
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j = RSA_size(rsa);
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if (i > (j - RSA_PKCS1_PADDING_SIZE)) {
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RSAerr(RSA_F_RSA_SIGN_ASN1_OCTET_STRING,
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RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
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return 0;
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}
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s = OPENSSL_malloc((unsigned int)j + 1);
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if (s == NULL) {
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RSAerr(RSA_F_RSA_SIGN_ASN1_OCTET_STRING, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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p = s;
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i2d_ASN1_OCTET_STRING(&sig, &p);
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i = RSA_private_encrypt(i, s, sigret, rsa, RSA_PKCS1_PADDING);
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if (i <= 0)
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ret = 0;
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else
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*siglen = i;
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OPENSSL_clear_free(s, (unsigned int)j + 1);
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return ret;
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}
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int RSA_verify_ASN1_OCTET_STRING(int dtype,
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const unsigned char *m,
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unsigned int m_len, unsigned char *sigbuf,
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unsigned int siglen, RSA *rsa)
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{
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int i, ret = 0;
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unsigned char *s;
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const unsigned char *p;
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ASN1_OCTET_STRING *sig = NULL;
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if (siglen != (unsigned int)RSA_size(rsa)) {
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RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING,
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RSA_R_WRONG_SIGNATURE_LENGTH);
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return 0;
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}
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s = OPENSSL_malloc((unsigned int)siglen);
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if (s == NULL) {
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RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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i = RSA_public_decrypt((int)siglen, sigbuf, s, rsa, RSA_PKCS1_PADDING);
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if (i <= 0)
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goto err;
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p = s;
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sig = d2i_ASN1_OCTET_STRING(NULL, &p, (long)i);
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if (sig == NULL)
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goto err;
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if (((unsigned int)sig->length != m_len) ||
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(memcmp(m, sig->data, m_len) != 0)) {
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RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING, RSA_R_BAD_SIGNATURE);
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} else {
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ret = 1;
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}
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err:
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ASN1_OCTET_STRING_free(sig);
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OPENSSL_clear_free(s, (unsigned int)siglen);
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return ret;
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}
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