| 1 | /*
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| 2 | * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | /*
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| 11 | * RSA low level APIs are deprecated for public use, but still ok for
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| 12 | * internal use.
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| 13 | */
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| 14 | #include "internal/deprecated.h"
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| 15 |
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| 16 | #include <stdio.h>
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| 17 | #include "internal/cryptlib.h"
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| 18 | #include <openssl/bn.h>
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| 19 | #include <openssl/rsa.h>
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| 20 | #include <openssl/objects.h>
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| 21 | #include <openssl/x509.h>
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| 22 |
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| 23 | int RSA_sign_ASN1_OCTET_STRING(int type,
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| 24 | const unsigned char *m, unsigned int m_len,
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| 25 | unsigned char *sigret, unsigned int *siglen,
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| 26 | RSA *rsa)
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| 27 | {
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| 28 | ASN1_OCTET_STRING sig;
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| 29 | int i, j, ret = 1;
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| 30 | unsigned char *p, *s;
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| 31 |
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| 32 | sig.type = V_ASN1_OCTET_STRING;
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| 33 | sig.length = m_len;
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| 34 | sig.data = (unsigned char *)m;
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| 35 |
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| 36 | i = i2d_ASN1_OCTET_STRING(&sig, NULL);
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| 37 | j = RSA_size(rsa);
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| 38 | if (i > (j - RSA_PKCS1_PADDING_SIZE)) {
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| 39 | ERR_raise(ERR_LIB_RSA, RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
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| 40 | return 0;
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| 41 | }
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| 42 | s = OPENSSL_malloc((unsigned int)j + 1);
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| 43 | if (s == NULL) {
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| 44 | ERR_raise(ERR_LIB_RSA, ERR_R_MALLOC_FAILURE);
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| 45 | return 0;
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| 46 | }
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| 47 | p = s;
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| 48 | i2d_ASN1_OCTET_STRING(&sig, &p);
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| 49 | i = RSA_private_encrypt(i, s, sigret, rsa, RSA_PKCS1_PADDING);
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| 50 | if (i <= 0)
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| 51 | ret = 0;
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| 52 | else
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| 53 | *siglen = i;
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| 54 |
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| 55 | OPENSSL_clear_free(s, (unsigned int)j + 1);
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| 56 | return ret;
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| 57 | }
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| 58 |
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| 59 | int RSA_verify_ASN1_OCTET_STRING(int dtype,
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| 60 | const unsigned char *m,
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| 61 | unsigned int m_len, unsigned char *sigbuf,
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| 62 | unsigned int siglen, RSA *rsa)
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| 63 | {
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| 64 | int i, ret = 0;
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| 65 | unsigned char *s;
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| 66 | const unsigned char *p;
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| 67 | ASN1_OCTET_STRING *sig = NULL;
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| 68 |
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| 69 | if (siglen != (unsigned int)RSA_size(rsa)) {
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| 70 | ERR_raise(ERR_LIB_RSA, RSA_R_WRONG_SIGNATURE_LENGTH);
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| 71 | return 0;
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| 72 | }
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| 73 |
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| 74 | s = OPENSSL_malloc((unsigned int)siglen);
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| 75 | if (s == NULL) {
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| 76 | ERR_raise(ERR_LIB_RSA, ERR_R_MALLOC_FAILURE);
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| 77 | goto err;
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| 78 | }
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| 79 | i = RSA_public_decrypt((int)siglen, sigbuf, s, rsa, RSA_PKCS1_PADDING);
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| 80 |
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| 81 | if (i <= 0)
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| 82 | goto err;
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| 83 |
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| 84 | p = s;
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| 85 | sig = d2i_ASN1_OCTET_STRING(NULL, &p, (long)i);
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| 86 | if (sig == NULL)
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| 87 | goto err;
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| 88 |
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| 89 | if (((unsigned int)sig->length != m_len) ||
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| 90 | (memcmp(m, sig->data, m_len) != 0)) {
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| 91 | ERR_raise(ERR_LIB_RSA, RSA_R_BAD_SIGNATURE);
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| 92 | } else {
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| 93 | ret = 1;
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| 94 | }
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| 95 | err:
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| 96 | ASN1_OCTET_STRING_free(sig);
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| 97 | OPENSSL_clear_free(s, (unsigned int)siglen);
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| 98 | return ret;
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| 99 | }
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