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- /*
- * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
- *
- * Licensed under the Apache License 2.0 (the "License"). You may not use
- * this file except in compliance with the License. You can obtain a copy
- * in the file LICENSE in the source distribution or at
- * https://www.openssl.org/source/license.html
- */
- /*
- * RSA low level APIs are deprecated for public use, but still ok for
- * internal use.
- */
- #include "internal/deprecated.h"
- #include <stdio.h>
- #include "internal/cryptlib.h"
- #include <openssl/bn.h>
- #include <openssl/rsa.h>
- #include <openssl/objects.h>
- #include <openssl/x509.h>
- int RSA_sign_ASN1_OCTET_STRING(int type,
- const unsigned char *m, unsigned int m_len,
- unsigned char *sigret, unsigned int *siglen,
- RSA *rsa)
- {
- ASN1_OCTET_STRING sig;
- int i, j, ret = 1;
- unsigned char *p, *s;
- sig.type = V_ASN1_OCTET_STRING;
- sig.length = m_len;
- sig.data = (unsigned char *)m;
- i = i2d_ASN1_OCTET_STRING(&sig, NULL);
- j = RSA_size(rsa);
- if (i > (j - RSA_PKCS1_PADDING_SIZE)) {
- RSAerr(RSA_F_RSA_SIGN_ASN1_OCTET_STRING,
- RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
- return 0;
- }
- s = OPENSSL_malloc((unsigned int)j + 1);
- if (s == NULL) {
- RSAerr(RSA_F_RSA_SIGN_ASN1_OCTET_STRING, ERR_R_MALLOC_FAILURE);
- return 0;
- }
- p = s;
- i2d_ASN1_OCTET_STRING(&sig, &p);
- i = RSA_private_encrypt(i, s, sigret, rsa, RSA_PKCS1_PADDING);
- if (i <= 0)
- ret = 0;
- else
- *siglen = i;
- OPENSSL_clear_free(s, (unsigned int)j + 1);
- return ret;
- }
- int RSA_verify_ASN1_OCTET_STRING(int dtype,
- const unsigned char *m,
- unsigned int m_len, unsigned char *sigbuf,
- unsigned int siglen, RSA *rsa)
- {
- int i, ret = 0;
- unsigned char *s;
- const unsigned char *p;
- ASN1_OCTET_STRING *sig = NULL;
- if (siglen != (unsigned int)RSA_size(rsa)) {
- RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING,
- RSA_R_WRONG_SIGNATURE_LENGTH);
- return 0;
- }
- s = OPENSSL_malloc((unsigned int)siglen);
- if (s == NULL) {
- RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING, ERR_R_MALLOC_FAILURE);
- goto err;
- }
- i = RSA_public_decrypt((int)siglen, sigbuf, s, rsa, RSA_PKCS1_PADDING);
- if (i <= 0)
- goto err;
- p = s;
- sig = d2i_ASN1_OCTET_STRING(NULL, &p, (long)i);
- if (sig == NULL)
- goto err;
- if (((unsigned int)sig->length != m_len) ||
- (memcmp(m, sig->data, m_len) != 0)) {
- RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING, RSA_R_BAD_SIGNATURE);
- } else {
- ret = 1;
- }
- err:
- ASN1_OCTET_STRING_free(sig);
- OPENSSL_clear_free(s, (unsigned int)siglen);
- return ret;
- }
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