diff options
Diffstat (limited to 'openssl-1.1.0h/crypto/evp/p5_crpt2.c')
| -rw-r--r-- | openssl-1.1.0h/crypto/evp/p5_crpt2.c | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/evp/p5_crpt2.c b/openssl-1.1.0h/crypto/evp/p5_crpt2.c new file mode 100644 index 0000000..6d5f289 --- /dev/null +++ b/openssl-1.1.0h/crypto/evp/p5_crpt2.c @@ -0,0 +1,280 @@ +/* + * Copyright 1999-2016 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 <stdlib.h> +#include "internal/cryptlib.h" +# include <openssl/x509.h> +# include <openssl/evp.h> +# include <openssl/hmac.h> +# include "evp_locl.h" + +/* set this to print out info about the keygen algorithm */ +/* #define OPENSSL_DEBUG_PKCS5V2 */ + +# ifdef OPENSSL_DEBUG_PKCS5V2 +static void h__dump(const unsigned char *p, int len); +# endif + +/* + * This is an implementation of PKCS#5 v2.0 password based encryption key + * derivation function PBKDF2. SHA1 version verified against test vectors + * posted by Peter Gutmann <pgut001@cs.auckland.ac.nz> to the PKCS-TNG + * <pkcs-tng@rsa.com> mailing list. + */ + +int PKCS5_PBKDF2_HMAC(const char *pass, int passlen, + const unsigned char *salt, int saltlen, int iter, + const EVP_MD *digest, int keylen, unsigned char *out) +{ + const char *empty = ""; + unsigned char digtmp[EVP_MAX_MD_SIZE], *p, itmp[4]; + int cplen, j, k, tkeylen, mdlen; + unsigned long i = 1; + HMAC_CTX *hctx_tpl = NULL, *hctx = NULL; + + mdlen = EVP_MD_size(digest); + if (mdlen < 0) + return 0; + + hctx_tpl = HMAC_CTX_new(); + if (hctx_tpl == NULL) + return 0; + p = out; + tkeylen = keylen; + if (pass == NULL) { + pass = empty; + passlen = 0; + } else if (passlen == -1) { + passlen = strlen(pass); + } + if (!HMAC_Init_ex(hctx_tpl, pass, passlen, digest, NULL)) { + HMAC_CTX_free(hctx_tpl); + return 0; + } + hctx = HMAC_CTX_new(); + if (hctx == NULL) { + HMAC_CTX_free(hctx_tpl); + return 0; + } + while (tkeylen) { + if (tkeylen > mdlen) + cplen = mdlen; + else + cplen = tkeylen; + /* + * We are unlikely to ever use more than 256 blocks (5120 bits!) but + * just in case... + */ + itmp[0] = (unsigned char)((i >> 24) & 0xff); + itmp[1] = (unsigned char)((i >> 16) & 0xff); + itmp[2] = (unsigned char)((i >> 8) & 0xff); + itmp[3] = (unsigned char)(i & 0xff); + if (!HMAC_CTX_copy(hctx, hctx_tpl)) { + HMAC_CTX_free(hctx); + HMAC_CTX_free(hctx_tpl); + return 0; + } + if (!HMAC_Update(hctx, salt, saltlen) + || !HMAC_Update(hctx, itmp, 4) + || !HMAC_Final(hctx, digtmp, NULL)) { + HMAC_CTX_free(hctx); + HMAC_CTX_free(hctx_tpl); + return 0; + } + HMAC_CTX_reset(hctx); + memcpy(p, digtmp, cplen); + for (j = 1; j < iter; j++) { + if (!HMAC_CTX_copy(hctx, hctx_tpl)) { + HMAC_CTX_free(hctx); + HMAC_CTX_free(hctx_tpl); + return 0; + } + if (!HMAC_Update(hctx, digtmp, mdlen) + || !HMAC_Final(hctx, digtmp, NULL)) { + HMAC_CTX_free(hctx); + HMAC_CTX_free(hctx_tpl); + return 0; + } + HMAC_CTX_reset(hctx); + for (k = 0; k < cplen; k++) + p[k] ^= digtmp[k]; + } + tkeylen -= cplen; + i++; + p += cplen; + } + HMAC_CTX_free(hctx); + HMAC_CTX_free(hctx_tpl); +# ifdef OPENSSL_DEBUG_PKCS5V2 + fprintf(stderr, "Password:\n"); + h__dump(pass, passlen); + fprintf(stderr, "Salt:\n"); + h__dump(salt, saltlen); + fprintf(stderr, "Iteration count %d\n", iter); + fprintf(stderr, "Key:\n"); + h__dump(out, keylen); +# endif + return 1; +} + +int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen, + const unsigned char *salt, int saltlen, int iter, + int keylen, unsigned char *out) +{ + return PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, EVP_sha1(), + keylen, out); +} + +# ifdef DO_TEST +main() +{ + unsigned char out[4]; + unsigned char salt[] = { 0x12, 0x34, 0x56, 0x78 }; + PKCS5_PBKDF2_HMAC_SHA1("password", -1, salt, 4, 5, 4, out); + fprintf(stderr, "Out %02X %02X %02X %02X\n", + out[0], out[1], out[2], out[3]); +} + +# endif + +/* + * Now the key derivation function itself. This is a bit evil because it has + * to check the ASN1 parameters are valid: and there are quite a few of + * them... + */ + +int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen, + ASN1_TYPE *param, const EVP_CIPHER *c, + const EVP_MD *md, int en_de) +{ + PBE2PARAM *pbe2 = NULL; + const EVP_CIPHER *cipher; + EVP_PBE_KEYGEN *kdf; + + int rv = 0; + + pbe2 = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBE2PARAM), param); + if (pbe2 == NULL) { + EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_DECODE_ERROR); + goto err; + } + + /* See if we recognise the key derivation function */ + if (!EVP_PBE_find(EVP_PBE_TYPE_KDF, OBJ_obj2nid(pbe2->keyfunc->algorithm), + NULL, NULL, &kdf)) { + EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, + EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION); + goto err; + } + + /* + * lets see if we recognise the encryption algorithm. + */ + + cipher = EVP_get_cipherbyobj(pbe2->encryption->algorithm); + + if (!cipher) { + EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_UNSUPPORTED_CIPHER); + goto err; + } + + /* Fixup cipher based on AlgorithmIdentifier */ + if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de)) + goto err; + if (EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) { + EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_CIPHER_PARAMETER_ERROR); + goto err; + } + rv = kdf(ctx, pass, passlen, pbe2->keyfunc->parameter, NULL, NULL, en_de); + err: + PBE2PARAM_free(pbe2); + return rv; +} + +int PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, + int passlen, ASN1_TYPE *param, + const EVP_CIPHER *c, const EVP_MD *md, int en_de) +{ + unsigned char *salt, key[EVP_MAX_KEY_LENGTH]; + int saltlen, iter; + int rv = 0; + unsigned int keylen = 0; + int prf_nid, hmac_md_nid; + PBKDF2PARAM *kdf = NULL; + const EVP_MD *prfmd; + + if (EVP_CIPHER_CTX_cipher(ctx) == NULL) { + EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_NO_CIPHER_SET); + goto err; + } + keylen = EVP_CIPHER_CTX_key_length(ctx); + OPENSSL_assert(keylen <= sizeof(key)); + + /* Decode parameter */ + + kdf = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBKDF2PARAM), param); + + if (kdf == NULL) { + EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_DECODE_ERROR); + goto err; + } + + keylen = EVP_CIPHER_CTX_key_length(ctx); + + /* Now check the parameters of the kdf */ + + if (kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)) { + EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_KEYLENGTH); + goto err; + } + + if (kdf->prf) + prf_nid = OBJ_obj2nid(kdf->prf->algorithm); + else + prf_nid = NID_hmacWithSHA1; + + if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, prf_nid, NULL, &hmac_md_nid, 0)) { + EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF); + goto err; + } + + prfmd = EVP_get_digestbynid(hmac_md_nid); + if (prfmd == NULL) { + EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF); + goto err; + } + + if (kdf->salt->type != V_ASN1_OCTET_STRING) { + EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_SALT_TYPE); + goto err; + } + + /* it seems that its all OK */ + salt = kdf->salt->value.octet_string->data; + saltlen = kdf->salt->value.octet_string->length; + iter = ASN1_INTEGER_get(kdf->iter); + if (!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, prfmd, + keylen, key)) + goto err; + rv = EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de); + err: + OPENSSL_cleanse(key, keylen); + PBKDF2PARAM_free(kdf); + return rv; +} + +# ifdef OPENSSL_DEBUG_PKCS5V2 +static void h__dump(const unsigned char *p, int len) +{ + for (; len--; p++) + fprintf(stderr, "%02X ", *p); + fprintf(stderr, "\n"); +} +# endif |