| /* |
| * Copyright 2006-2022 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/asn1t.h> |
| #include <openssl/x509.h> |
| #include <openssl/bn.h> |
| #include <openssl/core_names.h> |
| #include <openssl/param_build.h> |
| #include "crypto/asn1.h" |
| #include "crypto/evp.h" |
| #include "crypto/rsa.h" |
| #include "rsa_local.h" |
| |
| /* Set any parameters associated with pkey */ |
| static int rsa_param_encode(const EVP_PKEY *pkey, |
| ASN1_STRING **pstr, int *pstrtype) |
| { |
| const RSA *rsa = pkey->pkey.rsa; |
| |
| *pstr = NULL; |
| /* If RSA it's just NULL type */ |
| if (RSA_test_flags(rsa, RSA_FLAG_TYPE_MASK) != RSA_FLAG_TYPE_RSASSAPSS) { |
| *pstrtype = V_ASN1_NULL; |
| return 1; |
| } |
| /* If no PSS parameters we omit parameters entirely */ |
| if (rsa->pss == NULL) { |
| *pstrtype = V_ASN1_UNDEF; |
| return 1; |
| } |
| /* Encode PSS parameters */ |
| if (ASN1_item_pack(rsa->pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), pstr) == NULL) |
| return 0; |
| |
| *pstrtype = V_ASN1_SEQUENCE; |
| return 1; |
| } |
| /* Decode any parameters and set them in RSA structure */ |
| static int rsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey) |
| { |
| unsigned char *penc = NULL; |
| int penclen; |
| ASN1_STRING *str; |
| int strtype; |
| |
| if (!rsa_param_encode(pkey, &str, &strtype)) |
| return 0; |
| penclen = i2d_RSAPublicKey(pkey->pkey.rsa, &penc); |
| if (penclen <= 0) |
| return 0; |
| if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(pkey->ameth->pkey_id), |
| strtype, str, penc, penclen)) |
| return 1; |
| |
| OPENSSL_free(penc); |
| return 0; |
| } |
| |
| static int rsa_pub_decode(EVP_PKEY *pkey, const X509_PUBKEY *pubkey) |
| { |
| const unsigned char *p; |
| int pklen; |
| X509_ALGOR *alg; |
| RSA *rsa = NULL; |
| |
| if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &alg, pubkey)) |
| return 0; |
| if ((rsa = d2i_RSAPublicKey(NULL, &p, pklen)) == NULL) |
| return 0; |
| if (!ossl_rsa_param_decode(rsa, alg)) { |
| RSA_free(rsa); |
| return 0; |
| } |
| |
| RSA_clear_flags(rsa, RSA_FLAG_TYPE_MASK); |
| switch (pkey->ameth->pkey_id) { |
| case EVP_PKEY_RSA: |
| RSA_set_flags(rsa, RSA_FLAG_TYPE_RSA); |
| break; |
| case EVP_PKEY_RSA_PSS: |
| RSA_set_flags(rsa, RSA_FLAG_TYPE_RSASSAPSS); |
| break; |
| default: |
| /* Leave the type bits zero */ |
| break; |
| } |
| |
| if (!EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa)) { |
| RSA_free(rsa); |
| return 0; |
| } |
| return 1; |
| } |
| |
| static int rsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) |
| { |
| /* |
| * Don't check the public/private key, this is mostly for smart |
| * cards. |
| */ |
| if (((RSA_flags(a->pkey.rsa) & RSA_METHOD_FLAG_NO_CHECK)) |
| || (RSA_flags(b->pkey.rsa) & RSA_METHOD_FLAG_NO_CHECK)) { |
| return 1; |
| } |
| |
| if (BN_cmp(b->pkey.rsa->n, a->pkey.rsa->n) != 0 |
| || BN_cmp(b->pkey.rsa->e, a->pkey.rsa->e) != 0) |
| return 0; |
| return 1; |
| } |
| |
| static int old_rsa_priv_decode(EVP_PKEY *pkey, |
| const unsigned char **pder, int derlen) |
| { |
| RSA *rsa; |
| |
| if ((rsa = d2i_RSAPrivateKey(NULL, pder, derlen)) == NULL) |
| return 0; |
| EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa); |
| return 1; |
| } |
| |
| static int old_rsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder) |
| { |
| return i2d_RSAPrivateKey(pkey->pkey.rsa, pder); |
| } |
| |
| static int rsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey) |
| { |
| unsigned char *rk = NULL; |
| int rklen; |
| ASN1_STRING *str; |
| int strtype; |
| |
| if (!rsa_param_encode(pkey, &str, &strtype)) |
| return 0; |
| rklen = i2d_RSAPrivateKey(pkey->pkey.rsa, &rk); |
| |
| if (rklen <= 0) { |
| ERR_raise(ERR_LIB_RSA, ERR_R_MALLOC_FAILURE); |
| ASN1_STRING_free(str); |
| return 0; |
| } |
| |
| if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(pkey->ameth->pkey_id), 0, |
| strtype, str, rk, rklen)) { |
| ERR_raise(ERR_LIB_RSA, ERR_R_MALLOC_FAILURE); |
| ASN1_STRING_free(str); |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static int rsa_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8) |
| { |
| int ret = 0; |
| RSA *rsa = ossl_rsa_key_from_pkcs8(p8, NULL, NULL); |
| |
| if (rsa != NULL) { |
| ret = 1; |
| EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa); |
| } |
| return ret; |
| } |
| |
| static int int_rsa_size(const EVP_PKEY *pkey) |
| { |
| return RSA_size(pkey->pkey.rsa); |
| } |
| |
| static int rsa_bits(const EVP_PKEY *pkey) |
| { |
| return BN_num_bits(pkey->pkey.rsa->n); |
| } |
| |
| static int rsa_security_bits(const EVP_PKEY *pkey) |
| { |
| return RSA_security_bits(pkey->pkey.rsa); |
| } |
| |
| static void int_rsa_free(EVP_PKEY *pkey) |
| { |
| RSA_free(pkey->pkey.rsa); |
| } |
| |
| static int rsa_pss_param_print(BIO *bp, int pss_key, RSA_PSS_PARAMS *pss, |
| int indent) |
| { |
| int rv = 0; |
| X509_ALGOR *maskHash = NULL; |
| |
| if (!BIO_indent(bp, indent, 128)) |
| goto err; |
| if (pss_key) { |
| if (pss == NULL) { |
| if (BIO_puts(bp, "No PSS parameter restrictions\n") <= 0) |
| return 0; |
| return 1; |
| } else { |
| if (BIO_puts(bp, "PSS parameter restrictions:") <= 0) |
| return 0; |
| } |
| } else if (pss == NULL) { |
| if (BIO_puts(bp, "(INVALID PSS PARAMETERS)\n") <= 0) |
| return 0; |
| return 1; |
| } |
| if (BIO_puts(bp, "\n") <= 0) |
| goto err; |
| if (pss_key) |
| indent += 2; |
| if (!BIO_indent(bp, indent, 128)) |
| goto err; |
| if (BIO_puts(bp, "Hash Algorithm: ") <= 0) |
| goto err; |
| |
| if (pss->hashAlgorithm) { |
| if (i2a_ASN1_OBJECT(bp, pss->hashAlgorithm->algorithm) <= 0) |
| goto err; |
| } else if (BIO_puts(bp, "sha1 (default)") <= 0) { |
| goto err; |
| } |
| |
| if (BIO_puts(bp, "\n") <= 0) |
| goto err; |
| |
| if (!BIO_indent(bp, indent, 128)) |
| goto err; |
| |
| if (BIO_puts(bp, "Mask Algorithm: ") <= 0) |
| goto err; |
| if (pss->maskGenAlgorithm) { |
| if (i2a_ASN1_OBJECT(bp, pss->maskGenAlgorithm->algorithm) <= 0) |
| goto err; |
| if (BIO_puts(bp, " with ") <= 0) |
| goto err; |
| maskHash = ossl_x509_algor_mgf1_decode(pss->maskGenAlgorithm); |
| if (maskHash != NULL) { |
| if (i2a_ASN1_OBJECT(bp, maskHash->algorithm) <= 0) |
| goto err; |
| } else if (BIO_puts(bp, "INVALID") <= 0) { |
| goto err; |
| } |
| } else if (BIO_puts(bp, "mgf1 with sha1 (default)") <= 0) { |
| goto err; |
| } |
| BIO_puts(bp, "\n"); |
| |
| if (!BIO_indent(bp, indent, 128)) |
| goto err; |
| if (BIO_printf(bp, "%s Salt Length: 0x", pss_key ? "Minimum" : "") <= 0) |
| goto err; |
| if (pss->saltLength) { |
| if (i2a_ASN1_INTEGER(bp, pss->saltLength) <= 0) |
| goto err; |
| } else if (BIO_puts(bp, "14 (default)") <= 0) { |
| goto err; |
| } |
| BIO_puts(bp, "\n"); |
| |
| if (!BIO_indent(bp, indent, 128)) |
| goto err; |
| if (BIO_puts(bp, "Trailer Field: 0x") <= 0) |
| goto err; |
| if (pss->trailerField) { |
| if (i2a_ASN1_INTEGER(bp, pss->trailerField) <= 0) |
| goto err; |
| } else if (BIO_puts(bp, "01 (default)") <= 0) { |
| goto err; |
| } |
| BIO_puts(bp, "\n"); |
| |
| rv = 1; |
| |
| err: |
| X509_ALGOR_free(maskHash); |
| return rv; |
| |
| } |
| |
| static int pkey_rsa_print(BIO *bp, const EVP_PKEY *pkey, int off, int priv) |
| { |
| const RSA *x = pkey->pkey.rsa; |
| char *str; |
| const char *s; |
| int ret = 0, mod_len = 0, ex_primes; |
| |
| if (x->n != NULL) |
| mod_len = BN_num_bits(x->n); |
| ex_primes = sk_RSA_PRIME_INFO_num(x->prime_infos); |
| |
| if (!BIO_indent(bp, off, 128)) |
| goto err; |
| |
| if (BIO_printf(bp, "%s ", pkey_is_pss(pkey) ? "RSA-PSS" : "RSA") <= 0) |
| goto err; |
| |
| if (priv && x->d) { |
| if (BIO_printf(bp, "Private-Key: (%d bit, %d primes)\n", |
| mod_len, ex_primes <= 0 ? 2 : ex_primes + 2) <= 0) |
| goto err; |
| str = "modulus:"; |
| s = "publicExponent:"; |
| } else { |
| if (BIO_printf(bp, "Public-Key: (%d bit)\n", mod_len) <= 0) |
| goto err; |
| str = "Modulus:"; |
| s = "Exponent:"; |
| } |
| if (!ASN1_bn_print(bp, str, x->n, NULL, off)) |
| goto err; |
| if (!ASN1_bn_print(bp, s, x->e, NULL, off)) |
| goto err; |
| if (priv) { |
| int i; |
| |
| if (!ASN1_bn_print(bp, "privateExponent:", x->d, NULL, off)) |
| goto err; |
| if (!ASN1_bn_print(bp, "prime1:", x->p, NULL, off)) |
| goto err; |
| if (!ASN1_bn_print(bp, "prime2:", x->q, NULL, off)) |
| goto err; |
| if (!ASN1_bn_print(bp, "exponent1:", x->dmp1, NULL, off)) |
| goto err; |
| if (!ASN1_bn_print(bp, "exponent2:", x->dmq1, NULL, off)) |
| goto err; |
| if (!ASN1_bn_print(bp, "coefficient:", x->iqmp, NULL, off)) |
| goto err; |
| for (i = 0; i < sk_RSA_PRIME_INFO_num(x->prime_infos); i++) { |
| /* print multi-prime info */ |
| BIGNUM *bn = NULL; |
| RSA_PRIME_INFO *pinfo; |
| int j; |
| |
| pinfo = sk_RSA_PRIME_INFO_value(x->prime_infos, i); |
| for (j = 0; j < 3; j++) { |
| if (!BIO_indent(bp, off, 128)) |
| goto err; |
| switch (j) { |
| case 0: |
| if (BIO_printf(bp, "prime%d:", i + 3) <= 0) |
| goto err; |
| bn = pinfo->r; |
| break; |
| case 1: |
| if (BIO_printf(bp, "exponent%d:", i + 3) <= 0) |
| goto err; |
| bn = pinfo->d; |
| break; |
| case 2: |
| if (BIO_printf(bp, "coefficient%d:", i + 3) <= 0) |
| goto err; |
| bn = pinfo->t; |
| break; |
| default: |
| break; |
| } |
| if (!ASN1_bn_print(bp, "", bn, NULL, off)) |
| goto err; |
| } |
| } |
| } |
| if (pkey_is_pss(pkey) && !rsa_pss_param_print(bp, 1, x->pss, off)) |
| goto err; |
| ret = 1; |
| err: |
| return ret; |
| } |
| |
| static int rsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent, |
| ASN1_PCTX *ctx) |
| { |
| return pkey_rsa_print(bp, pkey, indent, 0); |
| } |
| |
| static int rsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent, |
| ASN1_PCTX *ctx) |
| { |
| return pkey_rsa_print(bp, pkey, indent, 1); |
| } |
| |
| static int rsa_sig_print(BIO *bp, const X509_ALGOR *sigalg, |
| const ASN1_STRING *sig, int indent, ASN1_PCTX *pctx) |
| { |
| if (OBJ_obj2nid(sigalg->algorithm) == EVP_PKEY_RSA_PSS) { |
| int rv; |
| RSA_PSS_PARAMS *pss = ossl_rsa_pss_decode(sigalg); |
| |
| rv = rsa_pss_param_print(bp, 0, pss, indent); |
| RSA_PSS_PARAMS_free(pss); |
| if (!rv) |
| return 0; |
| } else if (BIO_puts(bp, "\n") <= 0) { |
| return 0; |
| } |
| if (sig) |
| return X509_signature_dump(bp, sig, indent); |
| return 1; |
| } |
| |
| static int rsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2) |
| { |
| const EVP_MD *md; |
| const EVP_MD *mgf1md; |
| int min_saltlen; |
| |
| switch (op) { |
| case ASN1_PKEY_CTRL_DEFAULT_MD_NID: |
| if (pkey->pkey.rsa->pss != NULL) { |
| if (!ossl_rsa_pss_get_param(pkey->pkey.rsa->pss, &md, &mgf1md, |
| &min_saltlen)) { |
| ERR_raise(ERR_LIB_RSA, ERR_R_INTERNAL_ERROR); |
| return 0; |
| } |
| *(int *)arg2 = EVP_MD_get_type(md); |
| /* Return of 2 indicates this MD is mandatory */ |
| return 2; |
| } |
| *(int *)arg2 = NID_sha256; |
| return 1; |
| |
| default: |
| return -2; |
| } |
| } |
| |
| /* |
| * Convert EVP_PKEY_CTX in PSS mode into corresponding algorithm parameter, |
| * suitable for setting an AlgorithmIdentifier. |
| */ |
| |
| static RSA_PSS_PARAMS *rsa_ctx_to_pss(EVP_PKEY_CTX *pkctx) |
| { |
| const EVP_MD *sigmd, *mgf1md; |
| EVP_PKEY *pk = EVP_PKEY_CTX_get0_pkey(pkctx); |
| int saltlen; |
| |
| if (EVP_PKEY_CTX_get_signature_md(pkctx, &sigmd) <= 0) |
| return NULL; |
| if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0) |
| return NULL; |
| if (!EVP_PKEY_CTX_get_rsa_pss_saltlen(pkctx, &saltlen)) |
| return NULL; |
| if (saltlen == -1) { |
| saltlen = EVP_MD_get_size(sigmd); |
| } else if (saltlen == -2 || saltlen == -3) { |
| saltlen = EVP_PKEY_get_size(pk) - EVP_MD_get_size(sigmd) - 2; |
| if ((EVP_PKEY_get_bits(pk) & 0x7) == 1) |
| saltlen--; |
| if (saltlen < 0) |
| return NULL; |
| } |
| |
| return ossl_rsa_pss_params_create(sigmd, mgf1md, saltlen); |
| } |
| |
| RSA_PSS_PARAMS *ossl_rsa_pss_params_create(const EVP_MD *sigmd, |
| const EVP_MD *mgf1md, int saltlen) |
| { |
| RSA_PSS_PARAMS *pss = RSA_PSS_PARAMS_new(); |
| |
| if (pss == NULL) |
| goto err; |
| if (saltlen != 20) { |
| pss->saltLength = ASN1_INTEGER_new(); |
| if (pss->saltLength == NULL) |
| goto err; |
| if (!ASN1_INTEGER_set(pss->saltLength, saltlen)) |
| goto err; |
| } |
| if (!ossl_x509_algor_new_from_md(&pss->hashAlgorithm, sigmd)) |
| goto err; |
| if (mgf1md == NULL) |
| mgf1md = sigmd; |
| if (!ossl_x509_algor_md_to_mgf1(&pss->maskGenAlgorithm, mgf1md)) |
| goto err; |
| if (!ossl_x509_algor_new_from_md(&pss->maskHash, mgf1md)) |
| goto err; |
| return pss; |
| err: |
| RSA_PSS_PARAMS_free(pss); |
| return NULL; |
| } |
| |
| ASN1_STRING *ossl_rsa_ctx_to_pss_string(EVP_PKEY_CTX *pkctx) |
| { |
| RSA_PSS_PARAMS *pss = rsa_ctx_to_pss(pkctx); |
| ASN1_STRING *os; |
| |
| if (pss == NULL) |
| return NULL; |
| |
| os = ASN1_item_pack(pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), NULL); |
| RSA_PSS_PARAMS_free(pss); |
| return os; |
| } |
| |
| /* |
| * From PSS AlgorithmIdentifier set public key parameters. If pkey isn't NULL |
| * then the EVP_MD_CTX is setup and initialised. If it is NULL parameters are |
| * passed to pkctx instead. |
| */ |
| |
| int ossl_rsa_pss_to_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pkctx, |
| const X509_ALGOR *sigalg, EVP_PKEY *pkey) |
| { |
| int rv = -1; |
| int saltlen; |
| const EVP_MD *mgf1md = NULL, *md = NULL; |
| RSA_PSS_PARAMS *pss; |
| |
| /* Sanity check: make sure it is PSS */ |
| if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) { |
| ERR_raise(ERR_LIB_RSA, RSA_R_UNSUPPORTED_SIGNATURE_TYPE); |
| return -1; |
| } |
| /* Decode PSS parameters */ |
| pss = ossl_rsa_pss_decode(sigalg); |
| |
| if (!ossl_rsa_pss_get_param(pss, &md, &mgf1md, &saltlen)) { |
| ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_PSS_PARAMETERS); |
| goto err; |
| } |
| |
| /* We have all parameters now set up context */ |
| if (pkey) { |
| if (!EVP_DigestVerifyInit(ctx, &pkctx, md, NULL, pkey)) |
| goto err; |
| } else { |
| const EVP_MD *checkmd; |
| if (EVP_PKEY_CTX_get_signature_md(pkctx, &checkmd) <= 0) |
| goto err; |
| if (EVP_MD_get_type(md) != EVP_MD_get_type(checkmd)) { |
| ERR_raise(ERR_LIB_RSA, RSA_R_DIGEST_DOES_NOT_MATCH); |
| goto err; |
| } |
| } |
| |
| if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_PSS_PADDING) <= 0) |
| goto err; |
| |
| if (EVP_PKEY_CTX_set_rsa_pss_saltlen(pkctx, saltlen) <= 0) |
| goto err; |
| |
| if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0) |
| goto err; |
| /* Carry on */ |
| rv = 1; |
| |
| err: |
| RSA_PSS_PARAMS_free(pss); |
| return rv; |
| } |
| |
| static int rsa_pss_verify_param(const EVP_MD **pmd, const EVP_MD **pmgf1md, |
| int *psaltlen, int *ptrailerField) |
| { |
| if (psaltlen != NULL && *psaltlen < 0) { |
| ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_SALT_LENGTH); |
| return 0; |
| } |
| /* |
| * low-level routines support only trailer field 0xbc (value 1) and |
| * PKCS#1 says we should reject any other value anyway. |
| */ |
| if (ptrailerField != NULL && *ptrailerField != 1) { |
| ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_TRAILER); |
| return 0; |
| } |
| return 1; |
| } |
| |
| int ossl_rsa_pss_get_param(const RSA_PSS_PARAMS *pss, const EVP_MD **pmd, |
| const EVP_MD **pmgf1md, int *psaltlen) |
| { |
| /* |
| * Callers do not care about the trailer field, and yet, we must |
| * pass it from get_param to verify_param, since the latter checks |
| * its value. |
| * |
| * When callers start caring, it's a simple thing to add another |
| * argument to this function. |
| */ |
| int trailerField = 0; |
| |
| return ossl_rsa_pss_get_param_unverified(pss, pmd, pmgf1md, psaltlen, |
| &trailerField) |
| && rsa_pss_verify_param(pmd, pmgf1md, psaltlen, &trailerField); |
| } |
| |
| /* |
| * Customised RSA item verification routine. This is called when a signature |
| * is encountered requiring special handling. We currently only handle PSS. |
| */ |
| |
| static int rsa_item_verify(EVP_MD_CTX *ctx, const ASN1_ITEM *it, |
| const void *asn, const X509_ALGOR *sigalg, |
| const ASN1_BIT_STRING *sig, EVP_PKEY *pkey) |
| { |
| /* Sanity check: make sure it is PSS */ |
| if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) { |
| ERR_raise(ERR_LIB_RSA, RSA_R_UNSUPPORTED_SIGNATURE_TYPE); |
| return -1; |
| } |
| if (ossl_rsa_pss_to_ctx(ctx, NULL, sigalg, pkey) > 0) { |
| /* Carry on */ |
| return 2; |
| } |
| return -1; |
| } |
| |
| static int rsa_item_sign(EVP_MD_CTX *ctx, const ASN1_ITEM *it, const void *asn, |
| X509_ALGOR *alg1, X509_ALGOR *alg2, |
| ASN1_BIT_STRING *sig) |
| { |
| int pad_mode; |
| EVP_PKEY_CTX *pkctx = EVP_MD_CTX_get_pkey_ctx(ctx); |
| |
| if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0) |
| return 0; |
| if (pad_mode == RSA_PKCS1_PADDING) |
| return 2; |
| if (pad_mode == RSA_PKCS1_PSS_PADDING) { |
| ASN1_STRING *os1 = ossl_rsa_ctx_to_pss_string(pkctx); |
| |
| if (os1 == NULL) |
| return 0; |
| /* Duplicate parameters if we have to */ |
| if (alg2 != NULL) { |
| ASN1_STRING *os2 = ASN1_STRING_dup(os1); |
| |
| if (os2 == NULL) |
| goto err; |
| if (!X509_ALGOR_set0(alg2, OBJ_nid2obj(EVP_PKEY_RSA_PSS), |
| V_ASN1_SEQUENCE, os2)) { |
| ASN1_STRING_free(os2); |
| goto err; |
| } |
| } |
| if (!X509_ALGOR_set0(alg1, OBJ_nid2obj(EVP_PKEY_RSA_PSS), |
| V_ASN1_SEQUENCE, os1)) |
| goto err; |
| return 3; |
| err: |
| ASN1_STRING_free(os1); |
| return 0; |
| } |
| return 2; |
| } |
| |
| static int rsa_sig_info_set(X509_SIG_INFO *siginf, const X509_ALGOR *sigalg, |
| const ASN1_STRING *sig) |
| { |
| int rv = 0; |
| int mdnid, saltlen; |
| uint32_t flags; |
| const EVP_MD *mgf1md = NULL, *md = NULL; |
| RSA_PSS_PARAMS *pss; |
| int secbits; |
| |
| /* Sanity check: make sure it is PSS */ |
| if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) |
| return 0; |
| /* Decode PSS parameters */ |
| pss = ossl_rsa_pss_decode(sigalg); |
| if (!ossl_rsa_pss_get_param(pss, &md, &mgf1md, &saltlen)) |
| goto err; |
| mdnid = EVP_MD_get_type(md); |
| /* |
| * For TLS need SHA256, SHA384 or SHA512, digest and MGF1 digest must |
| * match and salt length must equal digest size |
| */ |
| if ((mdnid == NID_sha256 || mdnid == NID_sha384 || mdnid == NID_sha512) |
| && mdnid == EVP_MD_get_type(mgf1md) |
| && saltlen == EVP_MD_get_size(md)) |
| flags = X509_SIG_INFO_TLS; |
| else |
| flags = 0; |
| /* Note: security bits half number of digest bits */ |
| secbits = EVP_MD_get_size(md) * 4; |
| /* |
| * SHA1 and MD5 are known to be broken. Reduce security bits so that |
| * they're no longer accepted at security level 1. The real values don't |
| * really matter as long as they're lower than 80, which is our security |
| * level 1. |
| * https://eprint.iacr.org/2020/014 puts a chosen-prefix attack for SHA1 at |
| * 2^63.4 |
| * https://documents.epfl.ch/users/l/le/lenstra/public/papers/lat.pdf |
| * puts a chosen-prefix attack for MD5 at 2^39. |
| */ |
| if (mdnid == NID_sha1) |
| secbits = 64; |
| else if (mdnid == NID_md5_sha1) |
| secbits = 68; |
| else if (mdnid == NID_md5) |
| secbits = 39; |
| X509_SIG_INFO_set(siginf, mdnid, EVP_PKEY_RSA_PSS, secbits, |
| flags); |
| rv = 1; |
| err: |
| RSA_PSS_PARAMS_free(pss); |
| return rv; |
| } |
| |
| static int rsa_pkey_check(const EVP_PKEY *pkey) |
| { |
| return RSA_check_key_ex(pkey->pkey.rsa, NULL); |
| } |
| |
| static size_t rsa_pkey_dirty_cnt(const EVP_PKEY *pkey) |
| { |
| return pkey->pkey.rsa->dirty_cnt; |
| } |
| |
| /* |
| * There is no need to do RSA_test_flags(rsa, RSA_FLAG_TYPE_RSASSAPSS) |
| * checks in this method since the caller tests EVP_KEYMGMT_is_a() first. |
| */ |
| static int rsa_int_export_to(const EVP_PKEY *from, int rsa_type, |
| void *to_keydata, |
| OSSL_FUNC_keymgmt_import_fn *importer, |
| OSSL_LIB_CTX *libctx, const char *propq) |
| { |
| RSA *rsa = from->pkey.rsa; |
| OSSL_PARAM_BLD *tmpl = OSSL_PARAM_BLD_new(); |
| OSSL_PARAM *params = NULL; |
| int selection = 0; |
| int rv = 0; |
| |
| if (tmpl == NULL) |
| return 0; |
| /* Public parameters must always be present */ |
| if (RSA_get0_n(rsa) == NULL || RSA_get0_e(rsa) == NULL) |
| goto err; |
| |
| if (!ossl_rsa_todata(rsa, tmpl, NULL, 1)) |
| goto err; |
| |
| selection |= OSSL_KEYMGMT_SELECT_PUBLIC_KEY; |
| if (RSA_get0_d(rsa) != NULL) |
| selection |= OSSL_KEYMGMT_SELECT_PRIVATE_KEY; |
| |
| if (rsa->pss != NULL) { |
| const EVP_MD *md = NULL, *mgf1md = NULL; |
| int md_nid, mgf1md_nid, saltlen, trailerfield; |
| RSA_PSS_PARAMS_30 pss_params; |
| |
| if (!ossl_rsa_pss_get_param_unverified(rsa->pss, &md, &mgf1md, |
| &saltlen, &trailerfield)) |
| goto err; |
| md_nid = EVP_MD_get_type(md); |
| mgf1md_nid = EVP_MD_get_type(mgf1md); |
| if (!ossl_rsa_pss_params_30_set_defaults(&pss_params) |
| || !ossl_rsa_pss_params_30_set_hashalg(&pss_params, md_nid) |
| || !ossl_rsa_pss_params_30_set_maskgenhashalg(&pss_params, |
| mgf1md_nid) |
| || !ossl_rsa_pss_params_30_set_saltlen(&pss_params, saltlen) |
| || !ossl_rsa_pss_params_30_todata(&pss_params, tmpl, NULL)) |
| goto err; |
| selection |= OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS; |
| } |
| |
| if ((params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL) |
| goto err; |
| |
| /* We export, the provider imports */ |
| rv = importer(to_keydata, selection, params); |
| |
| err: |
| OSSL_PARAM_free(params); |
| OSSL_PARAM_BLD_free(tmpl); |
| return rv; |
| } |
| |
| static int rsa_int_import_from(const OSSL_PARAM params[], void *vpctx, |
| int rsa_type) |
| { |
| EVP_PKEY_CTX *pctx = vpctx; |
| EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(pctx); |
| RSA *rsa = ossl_rsa_new_with_ctx(pctx->libctx); |
| RSA_PSS_PARAMS_30 rsa_pss_params = { 0, }; |
| int pss_defaults_set = 0; |
| int ok = 0; |
| |
| if (rsa == NULL) { |
| ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE); |
| return 0; |
| } |
| |
| RSA_clear_flags(rsa, RSA_FLAG_TYPE_MASK); |
| RSA_set_flags(rsa, rsa_type); |
| |
| if (!ossl_rsa_pss_params_30_fromdata(&rsa_pss_params, &pss_defaults_set, |
| params, pctx->libctx)) |
| goto err; |
| |
| switch (rsa_type) { |
| case RSA_FLAG_TYPE_RSA: |
| /* |
| * Were PSS parameters filled in? |
| * In that case, something's wrong |
| */ |
| if (!ossl_rsa_pss_params_30_is_unrestricted(&rsa_pss_params)) |
| goto err; |
| break; |
| case RSA_FLAG_TYPE_RSASSAPSS: |
| /* |
| * Were PSS parameters filled in? In that case, create the old |
| * RSA_PSS_PARAMS structure. Otherwise, this is an unrestricted key. |
| */ |
| if (!ossl_rsa_pss_params_30_is_unrestricted(&rsa_pss_params)) { |
| /* Create the older RSA_PSS_PARAMS from RSA_PSS_PARAMS_30 data */ |
| int mdnid = ossl_rsa_pss_params_30_hashalg(&rsa_pss_params); |
| int mgf1mdnid = ossl_rsa_pss_params_30_maskgenhashalg(&rsa_pss_params); |
| int saltlen = ossl_rsa_pss_params_30_saltlen(&rsa_pss_params); |
| const EVP_MD *md = EVP_get_digestbynid(mdnid); |
| const EVP_MD *mgf1md = EVP_get_digestbynid(mgf1mdnid); |
| |
| if ((rsa->pss = ossl_rsa_pss_params_create(md, mgf1md, |
| saltlen)) == NULL) |
| goto err; |
| } |
| break; |
| default: |
| /* RSA key sub-types we don't know how to handle yet */ |
| goto err; |
| } |
| |
| if (!ossl_rsa_fromdata(rsa, params, 1)) |
| goto err; |
| |
| switch (rsa_type) { |
| case RSA_FLAG_TYPE_RSA: |
| ok = EVP_PKEY_assign_RSA(pkey, rsa); |
| break; |
| case RSA_FLAG_TYPE_RSASSAPSS: |
| ok = EVP_PKEY_assign(pkey, EVP_PKEY_RSA_PSS, rsa); |
| break; |
| } |
| |
| err: |
| if (!ok) |
| RSA_free(rsa); |
| return ok; |
| } |
| |
| static int rsa_pkey_export_to(const EVP_PKEY *from, void *to_keydata, |
| OSSL_FUNC_keymgmt_import_fn *importer, |
| OSSL_LIB_CTX *libctx, const char *propq) |
| { |
| return rsa_int_export_to(from, RSA_FLAG_TYPE_RSA, to_keydata, |
| importer, libctx, propq); |
| } |
| |
| static int rsa_pss_pkey_export_to(const EVP_PKEY *from, void *to_keydata, |
| OSSL_FUNC_keymgmt_import_fn *importer, |
| OSSL_LIB_CTX *libctx, const char *propq) |
| { |
| return rsa_int_export_to(from, RSA_FLAG_TYPE_RSASSAPSS, to_keydata, |
| importer, libctx, propq); |
| } |
| |
| static int rsa_pkey_import_from(const OSSL_PARAM params[], void *vpctx) |
| { |
| return rsa_int_import_from(params, vpctx, RSA_FLAG_TYPE_RSA); |
| } |
| |
| static int rsa_pss_pkey_import_from(const OSSL_PARAM params[], void *vpctx) |
| { |
| return rsa_int_import_from(params, vpctx, RSA_FLAG_TYPE_RSASSAPSS); |
| } |
| |
| static int rsa_pkey_copy(EVP_PKEY *to, EVP_PKEY *from) |
| { |
| RSA *rsa = from->pkey.rsa; |
| RSA *dupkey = NULL; |
| int ret; |
| |
| if (rsa != NULL) { |
| dupkey = ossl_rsa_dup(rsa, OSSL_KEYMGMT_SELECT_ALL); |
| if (dupkey == NULL) |
| return 0; |
| } |
| |
| ret = EVP_PKEY_assign(to, from->type, dupkey); |
| if (!ret) |
| RSA_free(dupkey); |
| return ret; |
| } |
| |
| const EVP_PKEY_ASN1_METHOD ossl_rsa_asn1_meths[2] = { |
| { |
| EVP_PKEY_RSA, |
| EVP_PKEY_RSA, |
| ASN1_PKEY_SIGPARAM_NULL, |
| |
| "RSA", |
| "OpenSSL RSA method", |
| |
| rsa_pub_decode, |
| rsa_pub_encode, |
| rsa_pub_cmp, |
| rsa_pub_print, |
| |
| rsa_priv_decode, |
| rsa_priv_encode, |
| rsa_priv_print, |
| |
| int_rsa_size, |
| rsa_bits, |
| rsa_security_bits, |
| |
| 0, 0, 0, 0, 0, 0, |
| |
| rsa_sig_print, |
| int_rsa_free, |
| rsa_pkey_ctrl, |
| old_rsa_priv_decode, |
| old_rsa_priv_encode, |
| rsa_item_verify, |
| rsa_item_sign, |
| rsa_sig_info_set, |
| rsa_pkey_check, |
| |
| 0, 0, |
| 0, 0, 0, 0, |
| |
| rsa_pkey_dirty_cnt, |
| rsa_pkey_export_to, |
| rsa_pkey_import_from, |
| rsa_pkey_copy |
| }, |
| |
| { |
| EVP_PKEY_RSA2, |
| EVP_PKEY_RSA, |
| ASN1_PKEY_ALIAS} |
| }; |
| |
| const EVP_PKEY_ASN1_METHOD ossl_rsa_pss_asn1_meth = { |
| EVP_PKEY_RSA_PSS, |
| EVP_PKEY_RSA_PSS, |
| ASN1_PKEY_SIGPARAM_NULL, |
| |
| "RSA-PSS", |
| "OpenSSL RSA-PSS method", |
| |
| rsa_pub_decode, |
| rsa_pub_encode, |
| rsa_pub_cmp, |
| rsa_pub_print, |
| |
| rsa_priv_decode, |
| rsa_priv_encode, |
| rsa_priv_print, |
| |
| int_rsa_size, |
| rsa_bits, |
| rsa_security_bits, |
| |
| 0, 0, 0, 0, 0, 0, |
| |
| rsa_sig_print, |
| int_rsa_free, |
| rsa_pkey_ctrl, |
| 0, 0, |
| rsa_item_verify, |
| rsa_item_sign, |
| rsa_sig_info_set, |
| rsa_pkey_check, |
| |
| 0, 0, |
| 0, 0, 0, 0, |
| |
| rsa_pkey_dirty_cnt, |
| rsa_pss_pkey_export_to, |
| rsa_pss_pkey_import_from, |
| rsa_pkey_copy |
| }; |
