| /* |
| * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved. |
| * |
| * Licensed under the OpenSSL license (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 |
| */ |
| |
| #include <stdio.h> |
| #include "internal/cryptlib.h" |
| #include <openssl/asn1t.h> |
| #include <openssl/x509.h> |
| #include <openssl/bn.h> |
| #include <openssl/cms.h> |
| #include "internal/asn1_int.h" |
| #include "internal/evp_int.h" |
| #include "rsa_locl.h" |
| |
| #ifndef OPENSSL_NO_CMS |
| static int rsa_cms_sign(CMS_SignerInfo *si); |
| static int rsa_cms_verify(CMS_SignerInfo *si); |
| static int rsa_cms_decrypt(CMS_RecipientInfo *ri); |
| static int rsa_cms_encrypt(CMS_RecipientInfo *ri); |
| #endif |
| |
| static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg); |
| |
| /* 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 (pkey->ameth->pkey_id == EVP_PKEY_RSA) { |
| *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_param_decode(RSA *rsa, const X509_ALGOR *alg) |
| { |
| const ASN1_OBJECT *algoid; |
| const void *algp; |
| int algptype; |
| |
| X509_ALGOR_get0(&algoid, &algptype, &algp, alg); |
| if (OBJ_obj2nid(algoid) == EVP_PKEY_RSA) |
| return 1; |
| if (algptype == V_ASN1_UNDEF) |
| return 1; |
| if (algptype != V_ASN1_SEQUENCE) { |
| RSAerr(RSA_F_RSA_PARAM_DECODE, RSA_R_INVALID_PSS_PARAMETERS); |
| return 0; |
| } |
| rsa->pss = rsa_pss_decode(alg); |
| if (rsa->pss == NULL) |
| return 0; |
| return 1; |
| } |
| |
| 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, 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) { |
| RSAerr(RSA_F_RSA_PUB_DECODE, ERR_R_RSA_LIB); |
| return 0; |
| } |
| if (!rsa_param_decode(rsa, alg)) { |
| RSA_free(rsa); |
| return 0; |
| } |
| EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa); |
| return 1; |
| } |
| |
| static int rsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) |
| { |
| 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) { |
| RSAerr(RSA_F_OLD_RSA_PRIV_DECODE, ERR_R_RSA_LIB); |
| 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) { |
| RSAerr(RSA_F_RSA_PRIV_ENCODE, 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)) { |
| RSAerr(RSA_F_RSA_PRIV_ENCODE, 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) |
| { |
| const unsigned char *p; |
| RSA *rsa; |
| int pklen; |
| const X509_ALGOR *alg; |
| |
| if (!PKCS8_pkey_get0(NULL, &p, &pklen, &alg, p8)) |
| return 0; |
| rsa = d2i_RSAPrivateKey(NULL, &p, pklen); |
| if (rsa == NULL) { |
| RSAerr(RSA_F_RSA_PRIV_DECODE, ERR_R_RSA_LIB); |
| return 0; |
| } |
| if (!rsa_param_decode(rsa, alg)) { |
| RSA_free(rsa); |
| return 0; |
| } |
| EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa); |
| return 1; |
| } |
| |
| 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 X509_ALGOR *rsa_mgf1_decode(X509_ALGOR *alg) |
| { |
| if (OBJ_obj2nid(alg->algorithm) != NID_mgf1) |
| return NULL; |
| return ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(X509_ALGOR), |
| alg->parameter); |
| } |
| |
| 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 = rsa_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, "BC (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; |
| |
| if (x->n != NULL) |
| mod_len = BN_num_bits(x->n); |
| |
| 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)\n", mod_len) <= 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) { |
| 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; |
| } |
| 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 RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg) |
| { |
| RSA_PSS_PARAMS *pss; |
| |
| pss = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_PSS_PARAMS), |
| alg->parameter); |
| |
| if (pss == NULL) |
| return NULL; |
| |
| if (pss->maskGenAlgorithm != NULL) { |
| pss->maskHash = rsa_mgf1_decode(pss->maskGenAlgorithm); |
| if (pss->maskHash == NULL) { |
| RSA_PSS_PARAMS_free(pss); |
| return NULL; |
| } |
| } |
| |
| return pss; |
| } |
| |
| 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 = rsa_pss_decode(sigalg); |
| |
| rv = rsa_pss_param_print(bp, 0, pss, indent); |
| RSA_PSS_PARAMS_free(pss); |
| if (!rv) |
| return 0; |
| } else if (!sig && 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) |
| { |
| X509_ALGOR *alg = NULL; |
| |
| switch (op) { |
| |
| case ASN1_PKEY_CTRL_PKCS7_SIGN: |
| if (arg1 == 0) |
| PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, NULL, &alg); |
| break; |
| |
| case ASN1_PKEY_CTRL_PKCS7_ENCRYPT: |
| if (pkey_is_pss(pkey)) |
| return -2; |
| if (arg1 == 0) |
| PKCS7_RECIP_INFO_get0_alg(arg2, &alg); |
| break; |
| #ifndef OPENSSL_NO_CMS |
| case ASN1_PKEY_CTRL_CMS_SIGN: |
| if (arg1 == 0) |
| return rsa_cms_sign(arg2); |
| else if (arg1 == 1) |
| return rsa_cms_verify(arg2); |
| break; |
| |
| case ASN1_PKEY_CTRL_CMS_ENVELOPE: |
| if (pkey_is_pss(pkey)) |
| return -2; |
| if (arg1 == 0) |
| return rsa_cms_encrypt(arg2); |
| else if (arg1 == 1) |
| return rsa_cms_decrypt(arg2); |
| break; |
| |
| case ASN1_PKEY_CTRL_CMS_RI_TYPE: |
| if (pkey_is_pss(pkey)) |
| return -2; |
| *(int *)arg2 = CMS_RECIPINFO_TRANS; |
| return 1; |
| #endif |
| |
| case ASN1_PKEY_CTRL_DEFAULT_MD_NID: |
| *(int *)arg2 = NID_sha256; |
| return 1; |
| |
| default: |
| return -2; |
| |
| } |
| |
| if (alg) |
| X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0); |
| |
| return 1; |
| |
| } |
| |
| /* allocate and set algorithm ID from EVP_MD, default SHA1 */ |
| static int rsa_md_to_algor(X509_ALGOR **palg, const EVP_MD *md) |
| { |
| if (md == NULL || EVP_MD_type(md) == NID_sha1) |
| return 1; |
| *palg = X509_ALGOR_new(); |
| if (*palg == NULL) |
| return 0; |
| X509_ALGOR_set_md(*palg, md); |
| return 1; |
| } |
| |
| /* Allocate and set MGF1 algorithm ID from EVP_MD */ |
| static int rsa_md_to_mgf1(X509_ALGOR **palg, const EVP_MD *mgf1md) |
| { |
| X509_ALGOR *algtmp = NULL; |
| ASN1_STRING *stmp = NULL; |
| |
| *palg = NULL; |
| if (mgf1md == NULL || EVP_MD_type(mgf1md) == NID_sha1) |
| return 1; |
| /* need to embed algorithm ID inside another */ |
| if (!rsa_md_to_algor(&algtmp, mgf1md)) |
| goto err; |
| if (ASN1_item_pack(algtmp, ASN1_ITEM_rptr(X509_ALGOR), &stmp) == NULL) |
| goto err; |
| *palg = X509_ALGOR_new(); |
| if (*palg == NULL) |
| goto err; |
| X509_ALGOR_set0(*palg, OBJ_nid2obj(NID_mgf1), V_ASN1_SEQUENCE, stmp); |
| stmp = NULL; |
| err: |
| ASN1_STRING_free(stmp); |
| X509_ALGOR_free(algtmp); |
| if (*palg) |
| return 1; |
| return 0; |
| } |
| |
| /* convert algorithm ID to EVP_MD, default SHA1 */ |
| static const EVP_MD *rsa_algor_to_md(X509_ALGOR *alg) |
| { |
| const EVP_MD *md; |
| |
| if (!alg) |
| return EVP_sha1(); |
| md = EVP_get_digestbyobj(alg->algorithm); |
| if (md == NULL) |
| RSAerr(RSA_F_RSA_ALGOR_TO_MD, RSA_R_UNKNOWN_DIGEST); |
| return md; |
| } |
| |
| /* |
| * 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_size(sigmd); |
| else if (saltlen == -2) { |
| saltlen = EVP_PKEY_size(pk) - EVP_MD_size(sigmd) - 2; |
| if ((EVP_PKEY_bits(pk) & 0x7) == 1) |
| saltlen--; |
| } |
| |
| return rsa_pss_params_create(sigmd, mgf1md, saltlen); |
| } |
| |
| RSA_PSS_PARAMS *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 (!rsa_md_to_algor(&pss->hashAlgorithm, sigmd)) |
| goto err; |
| if (mgf1md == NULL) |
| mgf1md = sigmd; |
| if (!rsa_md_to_mgf1(&pss->maskGenAlgorithm, mgf1md)) |
| goto err; |
| return pss; |
| err: |
| RSA_PSS_PARAMS_free(pss); |
| return NULL; |
| } |
| |
| static ASN1_STRING *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. |
| */ |
| |
| static int rsa_pss_to_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pkctx, |
| 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) { |
| RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_UNSUPPORTED_SIGNATURE_TYPE); |
| return -1; |
| } |
| /* Decode PSS parameters */ |
| pss = rsa_pss_decode(sigalg); |
| |
| if (!rsa_pss_get_param(pss, &md, &mgf1md, &saltlen)) { |
| RSAerr(RSA_F_RSA_PSS_TO_CTX, 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_type(md) != EVP_MD_type(checkmd)) { |
| RSAerr(RSA_F_RSA_PSS_TO_CTX, 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; |
| } |
| |
| int rsa_pss_get_param(const RSA_PSS_PARAMS *pss, const EVP_MD **pmd, |
| const EVP_MD **pmgf1md, int *psaltlen) |
| { |
| if (pss == NULL) |
| return 0; |
| *pmd = rsa_algor_to_md(pss->hashAlgorithm); |
| if (*pmd == NULL) |
| return 0; |
| *pmgf1md = rsa_algor_to_md(pss->maskHash); |
| if (*pmgf1md == NULL) |
| return 0; |
| if (pss->saltLength) { |
| *psaltlen = ASN1_INTEGER_get(pss->saltLength); |
| if (*psaltlen < 0) { |
| RSAerr(RSA_F_RSA_PSS_GET_PARAM, RSA_R_INVALID_SALT_LENGTH); |
| return 0; |
| } |
| } else { |
| *psaltlen = 20; |
| } |
| |
| /* |
| * low-level routines support only trailer field 0xbc (value 1) and |
| * PKCS#1 says we should reject any other value anyway. |
| */ |
| if (pss->trailerField && ASN1_INTEGER_get(pss->trailerField) != 1) { |
| RSAerr(RSA_F_RSA_PSS_GET_PARAM, RSA_R_INVALID_TRAILER); |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| #ifndef OPENSSL_NO_CMS |
| static int rsa_cms_verify(CMS_SignerInfo *si) |
| { |
| int nid, nid2; |
| X509_ALGOR *alg; |
| EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si); |
| |
| CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg); |
| nid = OBJ_obj2nid(alg->algorithm); |
| if (nid == EVP_PKEY_RSA_PSS) |
| return rsa_pss_to_ctx(NULL, pkctx, alg, NULL); |
| /* Only PSS allowed for PSS keys */ |
| if (pkey_ctx_is_pss(pkctx)) { |
| RSAerr(RSA_F_RSA_CMS_VERIFY, RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE); |
| return 0; |
| } |
| if (nid == NID_rsaEncryption) |
| return 1; |
| /* Workaround for some implementation that use a signature OID */ |
| if (OBJ_find_sigid_algs(nid, NULL, &nid2)) { |
| if (nid2 == NID_rsaEncryption) |
| return 1; |
| } |
| return 0; |
| } |
| #endif |
| |
| /* |
| * 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, void *asn, |
| X509_ALGOR *sigalg, ASN1_BIT_STRING *sig, |
| EVP_PKEY *pkey) |
| { |
| /* Sanity check: make sure it is PSS */ |
| if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) { |
| RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNSUPPORTED_SIGNATURE_TYPE); |
| return -1; |
| } |
| if (rsa_pss_to_ctx(ctx, NULL, sigalg, pkey) > 0) { |
| /* Carry on */ |
| return 2; |
| } |
| return -1; |
| } |
| |
| #ifndef OPENSSL_NO_CMS |
| static int rsa_cms_sign(CMS_SignerInfo *si) |
| { |
| int pad_mode = RSA_PKCS1_PADDING; |
| X509_ALGOR *alg; |
| EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si); |
| ASN1_STRING *os = NULL; |
| |
| CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg); |
| if (pkctx) { |
| if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0) |
| return 0; |
| } |
| if (pad_mode == RSA_PKCS1_PADDING) { |
| X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0); |
| return 1; |
| } |
| /* We don't support it */ |
| if (pad_mode != RSA_PKCS1_PSS_PADDING) |
| return 0; |
| os = rsa_ctx_to_pss_string(pkctx); |
| if (!os) |
| return 0; |
| X509_ALGOR_set0(alg, OBJ_nid2obj(EVP_PKEY_RSA_PSS), V_ASN1_SEQUENCE, os); |
| return 1; |
| } |
| #endif |
| |
| static int rsa_item_sign(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn, |
| X509_ALGOR *alg1, X509_ALGOR *alg2, |
| ASN1_BIT_STRING *sig) |
| { |
| int pad_mode; |
| EVP_PKEY_CTX *pkctx = EVP_MD_CTX_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 = NULL; |
| os1 = rsa_ctx_to_pss_string(pkctx); |
| if (!os1) |
| return 0; |
| /* Duplicate parameters if we have to */ |
| if (alg2) { |
| ASN1_STRING *os2 = ASN1_STRING_dup(os1); |
| if (!os2) { |
| ASN1_STRING_free(os1); |
| return 0; |
| } |
| X509_ALGOR_set0(alg2, OBJ_nid2obj(EVP_PKEY_RSA_PSS), |
| V_ASN1_SEQUENCE, os2); |
| } |
| X509_ALGOR_set0(alg1, OBJ_nid2obj(EVP_PKEY_RSA_PSS), |
| V_ASN1_SEQUENCE, os1); |
| return 3; |
| } |
| 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; |
| |
| /* Sanity check: make sure it is PSS */ |
| if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) |
| return 0; |
| /* Decode PSS parameters */ |
| pss = rsa_pss_decode(sigalg); |
| if (!rsa_pss_get_param(pss, &md, &mgf1md, &saltlen)) |
| goto err; |
| mdnid = EVP_MD_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_type(mgf1md) && saltlen == EVP_MD_size(md)) |
| flags = X509_SIG_INFO_TLS; |
| else |
| flags = 0; |
| /* Note: security bits half number of digest bits */ |
| X509_SIG_INFO_set(siginf, mdnid, EVP_PKEY_RSA_PSS, EVP_MD_size(md) * 4, |
| flags); |
| rv = 1; |
| err: |
| RSA_PSS_PARAMS_free(pss); |
| return rv; |
| } |
| |
| #ifndef OPENSSL_NO_CMS |
| static RSA_OAEP_PARAMS *rsa_oaep_decode(const X509_ALGOR *alg) |
| { |
| RSA_OAEP_PARAMS *oaep; |
| |
| oaep = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_OAEP_PARAMS), |
| alg->parameter); |
| |
| if (oaep == NULL) |
| return NULL; |
| |
| if (oaep->maskGenFunc != NULL) { |
| oaep->maskHash = rsa_mgf1_decode(oaep->maskGenFunc); |
| if (oaep->maskHash == NULL) { |
| RSA_OAEP_PARAMS_free(oaep); |
| return NULL; |
| } |
| } |
| return oaep; |
| } |
| |
| static int rsa_cms_decrypt(CMS_RecipientInfo *ri) |
| { |
| EVP_PKEY_CTX *pkctx; |
| X509_ALGOR *cmsalg; |
| int nid; |
| int rv = -1; |
| unsigned char *label = NULL; |
| int labellen = 0; |
| const EVP_MD *mgf1md = NULL, *md = NULL; |
| RSA_OAEP_PARAMS *oaep; |
| |
| pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri); |
| if (pkctx == NULL) |
| return 0; |
| if (!CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &cmsalg)) |
| return -1; |
| nid = OBJ_obj2nid(cmsalg->algorithm); |
| if (nid == NID_rsaEncryption) |
| return 1; |
| if (nid != NID_rsaesOaep) { |
| RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_ENCRYPTION_TYPE); |
| return -1; |
| } |
| /* Decode OAEP parameters */ |
| oaep = rsa_oaep_decode(cmsalg); |
| |
| if (oaep == NULL) { |
| RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_OAEP_PARAMETERS); |
| goto err; |
| } |
| |
| mgf1md = rsa_algor_to_md(oaep->maskHash); |
| if (mgf1md == NULL) |
| goto err; |
| md = rsa_algor_to_md(oaep->hashFunc); |
| if (md == NULL) |
| goto err; |
| |
| if (oaep->pSourceFunc != NULL) { |
| X509_ALGOR *plab = oaep->pSourceFunc; |
| |
| if (OBJ_obj2nid(plab->algorithm) != NID_pSpecified) { |
| RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_LABEL_SOURCE); |
| goto err; |
| } |
| if (plab->parameter->type != V_ASN1_OCTET_STRING) { |
| RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_LABEL); |
| goto err; |
| } |
| |
| label = plab->parameter->value.octet_string->data; |
| /* Stop label being freed when OAEP parameters are freed */ |
| plab->parameter->value.octet_string->data = NULL; |
| labellen = plab->parameter->value.octet_string->length; |
| } |
| |
| if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_OAEP_PADDING) <= 0) |
| goto err; |
| if (EVP_PKEY_CTX_set_rsa_oaep_md(pkctx, md) <= 0) |
| goto err; |
| if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0) |
| goto err; |
| if (EVP_PKEY_CTX_set0_rsa_oaep_label(pkctx, label, labellen) <= 0) |
| goto err; |
| /* Carry on */ |
| rv = 1; |
| |
| err: |
| RSA_OAEP_PARAMS_free(oaep); |
| return rv; |
| } |
| |
| static int rsa_cms_encrypt(CMS_RecipientInfo *ri) |
| { |
| const EVP_MD *md, *mgf1md; |
| RSA_OAEP_PARAMS *oaep = NULL; |
| ASN1_STRING *os = NULL; |
| X509_ALGOR *alg; |
| EVP_PKEY_CTX *pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri); |
| int pad_mode = RSA_PKCS1_PADDING, rv = 0, labellen; |
| unsigned char *label; |
| |
| CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &alg); |
| if (pkctx) { |
| if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0) |
| return 0; |
| } |
| if (pad_mode == RSA_PKCS1_PADDING) { |
| X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0); |
| return 1; |
| } |
| /* Not supported */ |
| if (pad_mode != RSA_PKCS1_OAEP_PADDING) |
| return 0; |
| if (EVP_PKEY_CTX_get_rsa_oaep_md(pkctx, &md) <= 0) |
| goto err; |
| if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0) |
| goto err; |
| labellen = EVP_PKEY_CTX_get0_rsa_oaep_label(pkctx, &label); |
| if (labellen < 0) |
| goto err; |
| oaep = RSA_OAEP_PARAMS_new(); |
| if (oaep == NULL) |
| goto err; |
| if (!rsa_md_to_algor(&oaep->hashFunc, md)) |
| goto err; |
| if (!rsa_md_to_mgf1(&oaep->maskGenFunc, mgf1md)) |
| goto err; |
| if (labellen > 0) { |
| ASN1_OCTET_STRING *los; |
| oaep->pSourceFunc = X509_ALGOR_new(); |
| if (oaep->pSourceFunc == NULL) |
| goto err; |
| los = ASN1_OCTET_STRING_new(); |
| if (los == NULL) |
| goto err; |
| if (!ASN1_OCTET_STRING_set(los, label, labellen)) { |
| ASN1_OCTET_STRING_free(los); |
| goto err; |
| } |
| X509_ALGOR_set0(oaep->pSourceFunc, OBJ_nid2obj(NID_pSpecified), |
| V_ASN1_OCTET_STRING, los); |
| } |
| /* create string with pss parameter encoding. */ |
| if (!ASN1_item_pack(oaep, ASN1_ITEM_rptr(RSA_OAEP_PARAMS), &os)) |
| goto err; |
| X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaesOaep), V_ASN1_SEQUENCE, os); |
| os = NULL; |
| rv = 1; |
| err: |
| RSA_OAEP_PARAMS_free(oaep); |
| ASN1_STRING_free(os); |
| return rv; |
| } |
| #endif |
| |
| const EVP_PKEY_ASN1_METHOD 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 |
| }, |
| |
| { |
| EVP_PKEY_RSA2, |
| EVP_PKEY_RSA, |
| ASN1_PKEY_ALIAS} |
| }; |
| |
| const EVP_PKEY_ASN1_METHOD 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, |
| }; |
