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Remove asn1 module dependency from RSASSA-PKCS1-v1_5 implementation.
Replace use of the asn1 module (X509_SIG, X509_ALGOR, ASN1_TYPE, ASN1_OCTET_STRING, i2d_X509_SIG(), etc.) as well as OID lookups using OBJ_nid2obj() with pre-generated DigestInfo encodings for MD2, MD5, MDC-2, SHA-1, SHA-2 and SHA-3; the encoding is selected based on the NID. This is similar to the approach used by the old FOM. Reviewed-by: Richard Levitte <levitte@openssl.org> Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org> Reviewed-by: Shane Lontis <shane.lontis@oracle.com> (Merged from https://github.com/openssl/openssl/pull/9138)
This commit is contained in:
Shane Lontis
parent
365955fb27
commit
169e422edd
@ -1,5 +1,5 @@
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/*
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* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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* Copyright 1995-2019 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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@ -14,68 +14,199 @@
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#include <openssl/objects.h>
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#include <openssl/x509.h>
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#include "crypto/x509.h"
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#ifndef OPENSSL_NO_MD2
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# include <openssl/md2.h> /* uses MD2_DIGEST_LENGTH */
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#endif
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#ifndef OPENSSL_NO_MD5
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# include <openssl/md5.h> /* uses MD5_DIGEST_LENGTH */
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#endif
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#ifndef OPENSSL_NO_MDC2
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# include <openssl/mdc2.h> /* uses MDC2_DIGEST_LENGTH */
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#endif
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#include <openssl/sha.h> /* uses SHA???_DIGEST_LENGTH */
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#include "rsa_local.h"
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/*
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* The general purpose ASN1 code is not available inside the FIPS provider.
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* To remove the dependency RSASSA-PKCS1-v1_5 DigestInfo encodings can be
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* treated as a special case by pregenerating the required ASN1 encoding.
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* This encoding will also be shared by the default provider.
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*
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* The EMSA-PKCS1-v1_5 encoding method includes an ASN.1 value of type
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* DigestInfo, where the type DigestInfo has the syntax
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*
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* DigestInfo ::= SEQUENCE {
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* digestAlgorithm DigestAlgorithm,
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* digest OCTET STRING
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* }
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*
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* DigestAlgorithm ::= AlgorithmIdentifier {
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* {PKCS1-v1-5DigestAlgorithms}
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* }
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*
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* The AlgorithmIdentifier is a sequence containing the digest OID and
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* parameters (a value of type NULL).
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*
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* The ENCODE_DIGESTINFO_SHA() and ENCODE_DIGESTINFO_MD() macros define an
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* initialized array containing the DER encoded DigestInfo for the specified
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* SHA or MD digest. The content of the OCTET STRING is not included.
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* |name| is the digest name.
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* |n| is last byte in the encoded OID for the digest.
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* |sz| is the digest length in bytes. It must not be greater than 110.
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*/
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#define ASN1_SEQUENCE 0x30
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#define ASN1_OCTET_STRING 0x04
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#define ASN1_NULL 0x05
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#define ASN1_OID 0x06
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/* SHA OIDs are of the form: (2 16 840 1 101 3 4 2 |n|) */
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#define ENCODE_DIGESTINFO_SHA(name, n, sz) \
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static const unsigned char digestinfo_##name##_der[] = { \
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ASN1_SEQUENCE, 0x11 + sz, \
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ASN1_SEQUENCE, 0x0d, \
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ASN1_OID, 0x09, 2 * 40 + 16, 0x86, 0x48, 1, 101, 3, 4, 2, n, \
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ASN1_NULL, 0x00, \
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ASN1_OCTET_STRING, sz \
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};
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/* MD2 and MD5 OIDs are of the form: (1 2 840 113549 2 |n|) */
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#define ENCODE_DIGESTINFO_MD(name, n, sz) \
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static const unsigned char digestinfo_##name##_der[] = { \
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ASN1_SEQUENCE, 0x10 + sz, \
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ASN1_SEQUENCE, 0x0c, \
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ASN1_OID, 0x08, 1 * 40 + 2, 0x86, 0x48, 0x86, 0xf7, 0x0d, 2, n, \
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ASN1_NULL, 0x00, \
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ASN1_OCTET_STRING, sz \
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};
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#ifndef FIPS_MODE
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# ifndef OPENSSL_NO_MD2
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ENCODE_DIGESTINFO_MD(md2, 0x02, MD2_DIGEST_LENGTH)
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# endif
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# ifndef OPENSSL_NO_MD5
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ENCODE_DIGESTINFO_MD(md5, 0x05, MD5_DIGEST_LENGTH)
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# endif
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# ifndef OPENSSL_NO_MDC2
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/* MDC-2 (2 5 8 3 101) */
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static const unsigned char digestinfo_mdc2_der[] = {
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ASN1_SEQUENCE, 0x0c + MDC2_DIGEST_LENGTH,
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ASN1_SEQUENCE, 0x08,
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ASN1_OID, 0x04, 2 * 40 + 5, 8, 3, 101,
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ASN1_NULL, 0x00,
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ASN1_OCTET_STRING, MDC2_DIGEST_LENGTH
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};
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# endif
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/* SHA-1 (1 3 14 3 2 26) */
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static const unsigned char digestinfo_sha1_der[] = {
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ASN1_SEQUENCE, 0x0d + SHA_DIGEST_LENGTH,
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ASN1_SEQUENCE, 0x09,
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ASN1_OID, 0x05, 1 * 40 + 3, 14, 3, 2, 26,
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ASN1_NULL, 0x00,
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ASN1_OCTET_STRING, SHA_DIGEST_LENGTH
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};
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#endif /* FIPS_MODE */
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ENCODE_DIGESTINFO_SHA(sha256, 0x01, SHA256_DIGEST_LENGTH)
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ENCODE_DIGESTINFO_SHA(sha384, 0x02, SHA384_DIGEST_LENGTH)
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ENCODE_DIGESTINFO_SHA(sha512, 0x03, SHA512_DIGEST_LENGTH)
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ENCODE_DIGESTINFO_SHA(sha224, 0x04, SHA224_DIGEST_LENGTH)
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ENCODE_DIGESTINFO_SHA(sha512_224, 0x05, SHA224_DIGEST_LENGTH)
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ENCODE_DIGESTINFO_SHA(sha512_256, 0x06, SHA256_DIGEST_LENGTH)
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ENCODE_DIGESTINFO_SHA(sha3_224, 0x07, SHA224_DIGEST_LENGTH)
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ENCODE_DIGESTINFO_SHA(sha3_256, 0x08, SHA256_DIGEST_LENGTH)
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ENCODE_DIGESTINFO_SHA(sha3_384, 0x09, SHA384_DIGEST_LENGTH)
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ENCODE_DIGESTINFO_SHA(sha3_512, 0x0a, SHA512_DIGEST_LENGTH)
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#define MD_CASE(name) \
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case NID_##name: \
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*len = sizeof(digestinfo_##name##_der); \
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return digestinfo_##name##_der;
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static const unsigned char *digestinfo_encoding(int nid, size_t *len)
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{
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switch (nid) {
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#ifndef FIPS_MODE
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# ifndef OPENSSL_NO_MDC2
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MD_CASE(mdc2)
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# endif
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# ifndef OPENSSL_NO_MD2
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MD_CASE(md2)
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# endif
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# ifndef OPENSSL_NO_MD5
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MD_CASE(md5)
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# endif
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MD_CASE(sha1)
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#endif /* FIPS_MODE */
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MD_CASE(sha224)
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MD_CASE(sha256)
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MD_CASE(sha384)
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MD_CASE(sha512)
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MD_CASE(sha512_224)
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MD_CASE(sha512_256)
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MD_CASE(sha3_224)
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MD_CASE(sha3_256)
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MD_CASE(sha3_384)
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MD_CASE(sha3_512)
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default:
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return NULL;
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}
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}
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/* Size of an SSL signature: MD5+SHA1 */
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#define SSL_SIG_LENGTH 36
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/*
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* encode_pkcs1 encodes a DigestInfo prefix of hash |type| and digest |m|, as
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* Encodes a DigestInfo prefix of hash |type| and digest |m|, as
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* described in EMSA-PKCS1-v1_5-ENCODE, RFC 3447 section 9.2 step 2. This
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* encodes the DigestInfo (T and tLen) but does not add the padding.
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*
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* On success, it returns one and sets |*out| to a newly allocated buffer
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* containing the result and |*out_len| to its length. The caller must free
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* |*out| with |OPENSSL_free|. Otherwise, it returns zero.
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* |*out| with OPENSSL_free(). Otherwise, it returns zero.
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*/
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static int encode_pkcs1(unsigned char **out, int *out_len, int type,
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const unsigned char *m, unsigned int m_len)
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static int encode_pkcs1(unsigned char **out, size_t *out_len, int type,
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const unsigned char *m, size_t m_len)
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{
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X509_SIG sig;
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X509_ALGOR algor;
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ASN1_TYPE parameter;
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ASN1_OCTET_STRING digest;
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uint8_t *der = NULL;
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int len;
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size_t di_prefix_len, dig_info_len;
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const unsigned char *di_prefix;
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unsigned char *dig_info;
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sig.algor = &algor;
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sig.algor->algorithm = OBJ_nid2obj(type);
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if (sig.algor->algorithm == NULL) {
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if (type == NID_undef) {
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RSAerr(RSA_F_ENCODE_PKCS1, RSA_R_UNKNOWN_ALGORITHM_TYPE);
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return 0;
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}
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if (OBJ_length(sig.algor->algorithm) == 0) {
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di_prefix = digestinfo_encoding(type, &di_prefix_len);
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if (di_prefix == NULL) {
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RSAerr(RSA_F_ENCODE_PKCS1,
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RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
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return 0;
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}
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parameter.type = V_ASN1_NULL;
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parameter.value.ptr = NULL;
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sig.algor->parameter = ¶meter;
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sig.digest = &digest;
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sig.digest->data = (unsigned char *)m;
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sig.digest->length = m_len;
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len = i2d_X509_SIG(&sig, &der);
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if (len < 0)
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dig_info_len = di_prefix_len + m_len;
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dig_info = OPENSSL_malloc(dig_info_len);
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if (dig_info == NULL) {
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RSAerr(RSA_F_ENCODE_PKCS1, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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memcpy(dig_info, di_prefix, di_prefix_len);
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memcpy(dig_info + di_prefix_len, m, m_len);
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*out = der;
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*out_len = len;
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*out = dig_info;
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*out_len = dig_info_len;
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return 1;
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}
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int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
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unsigned char *sigret, unsigned int *siglen, RSA *rsa)
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{
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int encrypt_len, encoded_len = 0, ret = 0;
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int encrypt_len, ret = 0;
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size_t encoded_len = 0;
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unsigned char *tmps = NULL;
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const unsigned char *encoded = NULL;
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if (rsa->meth->rsa_sign) {
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if (rsa->meth->rsa_sign != NULL)
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return rsa->meth->rsa_sign(type, m, m_len, sigret, siglen, rsa);
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}
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/* Compute the encoded digest. */
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if (type == NID_md5_sha1) {
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@ -96,11 +227,11 @@ int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
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encoded = tmps;
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}
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if (encoded_len > RSA_size(rsa) - RSA_PKCS1_PADDING_SIZE) {
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if (encoded_len + RSA_PKCS1_PADDING_SIZE > (size_t)RSA_size(rsa)) {
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RSAerr(RSA_F_RSA_SIGN, RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
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goto err;
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}
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encrypt_len = RSA_private_encrypt(encoded_len, encoded, sigret, rsa,
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encrypt_len = RSA_private_encrypt((int)encoded_len, encoded, sigret, rsa,
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RSA_PKCS1_PADDING);
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if (encrypt_len <= 0)
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goto err;
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@ -109,23 +240,25 @@ int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
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ret = 1;
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err:
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OPENSSL_clear_free(tmps, (size_t)encoded_len);
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OPENSSL_clear_free(tmps, encoded_len);
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return ret;
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}
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/*
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* int_rsa_verify verifies an RSA signature in |sigbuf| using |rsa|. It may be
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* called in two modes. If |rm| is NULL, it verifies the signature for digest
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* |m|. Otherwise, it recovers the digest from the signature, writing the digest
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* to |rm| and the length to |*prm_len|. |type| is the NID of the digest
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* algorithm to use. It returns one on successful verification and zero
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* otherwise.
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* Verify an RSA signature in |sigbuf| using |rsa|.
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* |type| is the NID of the digest algorithm to use.
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* If |rm| is NULL, it verifies the signature for digest |m|, otherwise
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* it recovers the digest from the signature, writing the digest to |rm| and
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* the length to |*prm_len|.
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*
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* It returns one on successful verification or zero otherwise.
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*/
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int int_rsa_verify(int type, const unsigned char *m, unsigned int m_len,
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unsigned char *rm, size_t *prm_len,
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const unsigned char *sigbuf, size_t siglen, RSA *rsa)
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{
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int decrypt_len, ret = 0, encoded_len = 0;
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int len, ret = 0;
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size_t decrypt_len, encoded_len = 0;
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unsigned char *decrypt_buf = NULL, *encoded = NULL;
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if (siglen != (size_t)RSA_size(rsa)) {
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@ -140,10 +273,11 @@ int int_rsa_verify(int type, const unsigned char *m, unsigned int m_len,
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goto err;
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}
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decrypt_len = RSA_public_decrypt((int)siglen, sigbuf, decrypt_buf, rsa,
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len = RSA_public_decrypt((int)siglen, sigbuf, decrypt_buf, rsa,
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RSA_PKCS1_PADDING);
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if (decrypt_len <= 0)
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if (len <= 0)
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goto err;
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decrypt_len = len;
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if (type == NID_md5_sha1) {
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/*
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@ -203,8 +337,11 @@ int int_rsa_verify(int type, const unsigned char *m, unsigned int m_len,
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goto err;
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}
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m_len = EVP_MD_size(md);
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if (m_len > (size_t)decrypt_len) {
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len = EVP_MD_size(md);
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if (len <= 0)
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goto err;
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m_len = (unsigned int)len;
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if (m_len > decrypt_len) {
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RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_INVALID_DIGEST_LENGTH);
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goto err;
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}
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@ -231,7 +368,7 @@ int int_rsa_verify(int type, const unsigned char *m, unsigned int m_len,
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ret = 1;
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err:
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OPENSSL_clear_free(encoded, (size_t)encoded_len);
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OPENSSL_clear_free(encoded, encoded_len);
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OPENSSL_clear_free(decrypt_buf, siglen);
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return ret;
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}
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@ -240,9 +377,8 @@ int RSA_verify(int type, const unsigned char *m, unsigned int m_len,
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const unsigned char *sigbuf, unsigned int siglen, RSA *rsa)
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{
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if (rsa->meth->rsa_verify) {
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if (rsa->meth->rsa_verify != NULL)
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return rsa->meth->rsa_verify(type, m, m_len, sigbuf, siglen, rsa);
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}
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return int_rsa_verify(type, m, m_len, NULL, NULL, sigbuf, siglen, rsa);
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}
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