diff options
Diffstat (limited to 'openssl-1.1.0h/crypto/kdf/tls1_prf.c')
| -rw-r--r-- | openssl-1.1.0h/crypto/kdf/tls1_prf.c | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/kdf/tls1_prf.c b/openssl-1.1.0h/crypto/kdf/tls1_prf.c new file mode 100644 index 0000000..fa13732 --- /dev/null +++ b/openssl-1.1.0h/crypto/kdf/tls1_prf.c @@ -0,0 +1,265 @@ +/* + * Copyright 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/kdf.h> +#include <openssl/evp.h> +#include "internal/evp_int.h" + +static int tls1_prf_alg(const EVP_MD *md, + const unsigned char *sec, size_t slen, + const unsigned char *seed, size_t seed_len, + unsigned char *out, size_t olen); + +#define TLS1_PRF_MAXBUF 1024 + +/* TLS KDF pkey context structure */ + +typedef struct { + /* Digest to use for PRF */ + const EVP_MD *md; + /* Secret value to use for PRF */ + unsigned char *sec; + size_t seclen; + /* Buffer of concatenated seed data */ + unsigned char seed[TLS1_PRF_MAXBUF]; + size_t seedlen; +} TLS1_PRF_PKEY_CTX; + +static int pkey_tls1_prf_init(EVP_PKEY_CTX *ctx) +{ + TLS1_PRF_PKEY_CTX *kctx; + + kctx = OPENSSL_zalloc(sizeof(*kctx)); + if (kctx == NULL) + return 0; + ctx->data = kctx; + + return 1; +} + +static void pkey_tls1_prf_cleanup(EVP_PKEY_CTX *ctx) +{ + TLS1_PRF_PKEY_CTX *kctx = ctx->data; + OPENSSL_clear_free(kctx->sec, kctx->seclen); + OPENSSL_cleanse(kctx->seed, kctx->seedlen); + OPENSSL_free(kctx); +} + +static int pkey_tls1_prf_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) +{ + TLS1_PRF_PKEY_CTX *kctx = ctx->data; + switch (type) { + case EVP_PKEY_CTRL_TLS_MD: + kctx->md = p2; + return 1; + + case EVP_PKEY_CTRL_TLS_SECRET: + if (p1 < 0) + return 0; + if (kctx->sec != NULL) + OPENSSL_clear_free(kctx->sec, kctx->seclen); + OPENSSL_cleanse(kctx->seed, kctx->seedlen); + kctx->seedlen = 0; + kctx->sec = OPENSSL_memdup(p2, p1); + if (kctx->sec == NULL) + return 0; + kctx->seclen = p1; + return 1; + + case EVP_PKEY_CTRL_TLS_SEED: + if (p1 == 0 || p2 == NULL) + return 1; + if (p1 < 0 || p1 > (int)(TLS1_PRF_MAXBUF - kctx->seedlen)) + return 0; + memcpy(kctx->seed + kctx->seedlen, p2, p1); + kctx->seedlen += p1; + return 1; + + default: + return -2; + + } +} + +static int pkey_tls1_prf_ctrl_str(EVP_PKEY_CTX *ctx, + const char *type, const char *value) +{ + if (value == NULL) { + KDFerr(KDF_F_PKEY_TLS1_PRF_CTRL_STR, KDF_R_VALUE_MISSING); + return 0; + } + if (strcmp(type, "md") == 0) { + TLS1_PRF_PKEY_CTX *kctx = ctx->data; + + const EVP_MD *md = EVP_get_digestbyname(value); + if (md == NULL) { + KDFerr(KDF_F_PKEY_TLS1_PRF_CTRL_STR, KDF_R_INVALID_DIGEST); + return 0; + } + kctx->md = md; + return 1; + } + if (strcmp(type, "secret") == 0) + return EVP_PKEY_CTX_str2ctrl(ctx, EVP_PKEY_CTRL_TLS_SECRET, value); + if (strcmp(type, "hexsecret") == 0) + return EVP_PKEY_CTX_hex2ctrl(ctx, EVP_PKEY_CTRL_TLS_SECRET, value); + if (strcmp(type, "seed") == 0) + return EVP_PKEY_CTX_str2ctrl(ctx, EVP_PKEY_CTRL_TLS_SEED, value); + if (strcmp(type, "hexseed") == 0) + return EVP_PKEY_CTX_hex2ctrl(ctx, EVP_PKEY_CTRL_TLS_SEED, value); + return -2; +} + +static int pkey_tls1_prf_derive(EVP_PKEY_CTX *ctx, unsigned char *key, + size_t *keylen) +{ + TLS1_PRF_PKEY_CTX *kctx = ctx->data; + if (kctx->md == NULL || kctx->sec == NULL || kctx->seedlen == 0) { + KDFerr(KDF_F_PKEY_TLS1_PRF_DERIVE, KDF_R_MISSING_PARAMETER); + return 0; + } + return tls1_prf_alg(kctx->md, kctx->sec, kctx->seclen, + kctx->seed, kctx->seedlen, + key, *keylen); +} + +const EVP_PKEY_METHOD tls1_prf_pkey_meth = { + EVP_PKEY_TLS1_PRF, + 0, + pkey_tls1_prf_init, + 0, + pkey_tls1_prf_cleanup, + + 0, 0, + 0, 0, + + 0, + 0, + + 0, + 0, + + 0, 0, + + 0, 0, 0, 0, + + 0, 0, + + 0, 0, + + 0, + pkey_tls1_prf_derive, + pkey_tls1_prf_ctrl, + pkey_tls1_prf_ctrl_str +}; + +static int tls1_prf_P_hash(const EVP_MD *md, + const unsigned char *sec, size_t sec_len, + const unsigned char *seed, size_t seed_len, + unsigned char *out, size_t olen) +{ + int chunk; + EVP_MD_CTX *ctx = NULL, *ctx_tmp = NULL, *ctx_init = NULL; + EVP_PKEY *mac_key = NULL; + unsigned char A1[EVP_MAX_MD_SIZE]; + size_t A1_len; + int ret = 0; + + chunk = EVP_MD_size(md); + OPENSSL_assert(chunk >= 0); + + ctx = EVP_MD_CTX_new(); + ctx_tmp = EVP_MD_CTX_new(); + ctx_init = EVP_MD_CTX_new(); + if (ctx == NULL || ctx_tmp == NULL || ctx_init == NULL) + goto err; + EVP_MD_CTX_set_flags(ctx_init, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); + mac_key = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL, sec, sec_len); + if (mac_key == NULL) + goto err; + if (!EVP_DigestSignInit(ctx_init, NULL, md, NULL, mac_key)) + goto err; + if (!EVP_MD_CTX_copy_ex(ctx, ctx_init)) + goto err; + if (seed != NULL && !EVP_DigestSignUpdate(ctx, seed, seed_len)) + goto err; + if (!EVP_DigestSignFinal(ctx, A1, &A1_len)) + goto err; + + for (;;) { + /* Reinit mac contexts */ + if (!EVP_MD_CTX_copy_ex(ctx, ctx_init)) + goto err; + if (!EVP_DigestSignUpdate(ctx, A1, A1_len)) + goto err; + if (olen > (size_t)chunk && !EVP_MD_CTX_copy_ex(ctx_tmp, ctx)) + goto err; + if (seed && !EVP_DigestSignUpdate(ctx, seed, seed_len)) + goto err; + + if (olen > (size_t)chunk) { + size_t mac_len; + if (!EVP_DigestSignFinal(ctx, out, &mac_len)) + goto err; + out += mac_len; + olen -= mac_len; + /* calc the next A1 value */ + if (!EVP_DigestSignFinal(ctx_tmp, A1, &A1_len)) + goto err; + } else { /* last one */ + + if (!EVP_DigestSignFinal(ctx, A1, &A1_len)) + goto err; + memcpy(out, A1, olen); + break; + } + } + ret = 1; + err: + EVP_PKEY_free(mac_key); + EVP_MD_CTX_free(ctx); + EVP_MD_CTX_free(ctx_tmp); + EVP_MD_CTX_free(ctx_init); + OPENSSL_cleanse(A1, sizeof(A1)); + return ret; +} + +static int tls1_prf_alg(const EVP_MD *md, + const unsigned char *sec, size_t slen, + const unsigned char *seed, size_t seed_len, + unsigned char *out, size_t olen) +{ + + if (EVP_MD_type(md) == NID_md5_sha1) { + size_t i; + unsigned char *tmp; + if (!tls1_prf_P_hash(EVP_md5(), sec, slen/2 + (slen & 1), + seed, seed_len, out, olen)) + return 0; + + tmp = OPENSSL_malloc(olen); + if (tmp == NULL) + return 0; + if (!tls1_prf_P_hash(EVP_sha1(), sec + slen/2, slen/2 + (slen & 1), + seed, seed_len, tmp, olen)) { + OPENSSL_clear_free(tmp, olen); + return 0; + } + for (i = 0; i < olen; i++) + out[i] ^= tmp[i]; + OPENSSL_clear_free(tmp, olen); + return 1; + } + if (!tls1_prf_P_hash(md, sec, slen, seed, seed_len, out, olen)) + return 0; + + return 1; +} |