X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fhmac%2Fhmac.c;h=9504aada943bd337f7fef851c5de82f7325f2626;hp=da363b795070cab0a56b5c84cf919bea6e9507de;hb=43ecb9c35caed8623cfd83e7d893b8b67725feb7;hpb=de941e289e5d320d2e3258b0ebf71562830aaabc diff --git a/crypto/hmac/hmac.c b/crypto/hmac/hmac.c index da363b7950..9504aada94 100644 --- a/crypto/hmac/hmac.c +++ b/crypto/hmac/hmac.c @@ -1,25 +1,24 @@ -/* crypto/hmac/hmac.c */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. - * + * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). - * + * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. - * + * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: @@ -34,10 +33,10 @@ * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). - * 4. If you include any Windows specific code (or a derivative thereof) from + * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" - * + * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE @@ -49,122 +48,236 @@ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. - * + * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ + #include #include #include +#include "internal/cryptlib.h" #include +#include +#include "hmac_lcl.h" + +int HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len, + const EVP_MD *md, ENGINE *impl) +{ + int i, j, reset = 0; + unsigned char pad[HMAC_MAX_MD_CBLOCK]; + + /* If we are changing MD then we must have a key */ + if (md != NULL && md != ctx->md && (key == NULL || len < 0)) + return 0; + + if (md != NULL) { + reset = 1; + ctx->md = md; + } else if (ctx->md) { + md = ctx->md; + } else { + return 0; + } + + if (key != NULL) { + reset = 1; + j = EVP_MD_block_size(md); + OPENSSL_assert(j <= (int)sizeof(ctx->key)); + if (j < len) { + if (!EVP_DigestInit_ex(ctx->md_ctx, md, impl)) + goto err; + if (!EVP_DigestUpdate(ctx->md_ctx, key, len)) + goto err; + if (!EVP_DigestFinal_ex(ctx->md_ctx, ctx->key, + &ctx->key_length)) + goto err; + } else { + if (len < 0 || len > (int)sizeof(ctx->key)) + return 0; + memcpy(ctx->key, key, len); + ctx->key_length = len; + } + if (ctx->key_length != HMAC_MAX_MD_CBLOCK) + memset(&ctx->key[ctx->key_length], 0, + HMAC_MAX_MD_CBLOCK - ctx->key_length); + } + + if (reset) { + for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++) + pad[i] = 0x36 ^ ctx->key[i]; + if (!EVP_DigestInit_ex(ctx->i_ctx, md, impl)) + goto err; + if (!EVP_DigestUpdate(ctx->i_ctx, pad, EVP_MD_block_size(md))) + goto err; + + for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++) + pad[i] = 0x5c ^ ctx->key[i]; + if (!EVP_DigestInit_ex(ctx->o_ctx, md, impl)) + goto err; + if (!EVP_DigestUpdate(ctx->o_ctx, pad, EVP_MD_block_size(md))) + goto err; + } + if (!EVP_MD_CTX_copy_ex(ctx->md_ctx, ctx->i_ctx)) + goto err; + return 1; + err: + return 0; +} + +#if OPENSSL_API_COMPAT < 0x10100000L +int HMAC_Init(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md) +{ + if (key && md) + HMAC_CTX_reset(ctx); + return HMAC_Init_ex(ctx, key, len, md, NULL); +} +#endif -void HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len, - const EVP_MD *md, ENGINE *impl) - { - int i,j,reset=0; - unsigned char pad[HMAC_MAX_MD_CBLOCK]; - - if (md != NULL) - { - reset=1; - ctx->md=md; - } - else - md=ctx->md; - - if (key != NULL) - { - reset=1; - j=EVP_MD_block_size(md); - if (j < len) - { - EVP_DigestInit_ex(&ctx->md_ctx,md, impl); - EVP_DigestUpdate(&ctx->md_ctx,key,len); - EVP_DigestFinal_ex(&(ctx->md_ctx),ctx->key, - &ctx->key_length); - } - else - { - memcpy(ctx->key,key,len); - ctx->key_length=len; - } - if(ctx->key_length != HMAC_MAX_MD_CBLOCK) - memset(&ctx->key[ctx->key_length], 0, - HMAC_MAX_MD_CBLOCK - ctx->key_length); - } - - if (reset) - { - for (i=0; ikey[i]; - EVP_DigestInit_ex(&ctx->i_ctx,md, impl); - EVP_DigestUpdate(&ctx->i_ctx,pad,EVP_MD_block_size(md)); - - for (i=0; ikey[i]; - EVP_DigestInit_ex(&ctx->o_ctx,md, impl); - EVP_DigestUpdate(&ctx->o_ctx,pad,EVP_MD_block_size(md)); - } - EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->i_ctx); - } - -void HMAC_Init(HMAC_CTX *ctx, const void *key, int len, - const EVP_MD *md) - { - if(key && md) - HMAC_CTX_init(ctx); - HMAC_Init_ex(ctx,key,len,md, NULL); - } - -void HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, int len) - { - EVP_DigestUpdate(&ctx->md_ctx,data,len); - } - -void HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len) - { - int j; - unsigned int i; - unsigned char buf[EVP_MAX_MD_SIZE]; - - j=EVP_MD_block_size(ctx->md); - - EVP_DigestFinal_ex(&ctx->md_ctx,buf,&i); - EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->o_ctx); - EVP_DigestUpdate(&ctx->md_ctx,buf,i); - EVP_DigestFinal_ex(&ctx->md_ctx,md,len); - } - -void HMAC_CTX_init(HMAC_CTX *ctx) - { - EVP_MD_CTX_init(&ctx->i_ctx); - EVP_MD_CTX_init(&ctx->o_ctx); - EVP_MD_CTX_init(&ctx->md_ctx); - } - -void HMAC_CTX_cleanup(HMAC_CTX *ctx) - { - EVP_MD_CTX_cleanup(&ctx->i_ctx); - EVP_MD_CTX_cleanup(&ctx->o_ctx); - EVP_MD_CTX_cleanup(&ctx->md_ctx); - memset(ctx,0,sizeof *ctx); - } +int HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len) +{ + if (!ctx->md) + return 0; + return EVP_DigestUpdate(ctx->md_ctx, data, len); +} + +int HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len) +{ + unsigned int i; + unsigned char buf[EVP_MAX_MD_SIZE]; + + if (!ctx->md) + goto err; + + if (!EVP_DigestFinal_ex(ctx->md_ctx, buf, &i)) + goto err; + if (!EVP_MD_CTX_copy_ex(ctx->md_ctx, ctx->o_ctx)) + goto err; + if (!EVP_DigestUpdate(ctx->md_ctx, buf, i)) + goto err; + if (!EVP_DigestFinal_ex(ctx->md_ctx, md, len)) + goto err; + return 1; + err: + return 0; +} + +size_t HMAC_size(HMAC_CTX *ctx) +{ + return EVP_MD_size((ctx)->md); +} + +HMAC_CTX *HMAC_CTX_new(void) +{ + HMAC_CTX *ctx = OPENSSL_zalloc(sizeof(HMAC_CTX)); + + if (ctx != NULL) { + if (!HMAC_CTX_reset(ctx)) { + HMAC_CTX_free(ctx); + return NULL; + } + } + return ctx; +} + +static void hmac_ctx_cleanup(HMAC_CTX *ctx) +{ + EVP_MD_CTX_reset(ctx->i_ctx); + EVP_MD_CTX_reset(ctx->o_ctx); + EVP_MD_CTX_reset(ctx->md_ctx); + ctx->md = NULL; + ctx->key_length = 0; + memset(ctx->key, 0, sizeof(HMAC_MAX_MD_CBLOCK)); +} + +void HMAC_CTX_free(HMAC_CTX *ctx) +{ + if (ctx != NULL) { + hmac_ctx_cleanup(ctx); + EVP_MD_CTX_free(ctx->i_ctx); + EVP_MD_CTX_free(ctx->o_ctx); + EVP_MD_CTX_free(ctx->md_ctx); + OPENSSL_free(ctx); + } +} + +int HMAC_CTX_reset(HMAC_CTX *ctx) +{ + hmac_ctx_cleanup(ctx); + if (ctx->i_ctx == NULL) + ctx->i_ctx = EVP_MD_CTX_new(); + if (ctx->i_ctx == NULL) + goto err; + if (ctx->o_ctx == NULL) + ctx->o_ctx = EVP_MD_CTX_new(); + if (ctx->o_ctx == NULL) + goto err; + if (ctx->md_ctx == NULL) + ctx->md_ctx = EVP_MD_CTX_new(); + if (ctx->md_ctx == NULL) + goto err; + ctx->md = NULL; + return 1; + err: + hmac_ctx_cleanup(ctx); + return 0; +} + +int HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx) +{ + if (!HMAC_CTX_reset(dctx)) + goto err; + if (!EVP_MD_CTX_copy_ex(dctx->i_ctx, sctx->i_ctx)) + goto err; + if (!EVP_MD_CTX_copy_ex(dctx->o_ctx, sctx->o_ctx)) + goto err; + if (!EVP_MD_CTX_copy_ex(dctx->md_ctx, sctx->md_ctx)) + goto err; + memcpy(dctx->key, sctx->key, HMAC_MAX_MD_CBLOCK); + dctx->key_length = sctx->key_length; + dctx->md = sctx->md; + return 1; + err: + hmac_ctx_cleanup(dctx); + return 0; +} unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len, - const unsigned char *d, int n, unsigned char *md, - unsigned int *md_len) - { - HMAC_CTX c; - static unsigned char m[EVP_MAX_MD_SIZE]; - - if (md == NULL) md=m; - HMAC_CTX_init(&c); - HMAC_Init(&c,key,key_len,evp_md); - HMAC_Update(&c,d,n); - HMAC_Final(&c,md,md_len); - HMAC_CTX_cleanup(&c); - return(md); - } + const unsigned char *d, size_t n, unsigned char *md, + unsigned int *md_len) +{ + HMAC_CTX *c = NULL; + static unsigned char m[EVP_MAX_MD_SIZE]; + static const unsigned char dummy_key[1] = {'\0'}; + + if (md == NULL) + md = m; + if ((c = HMAC_CTX_new()) == NULL) + goto err; + + /* For HMAC_Init_ex, NULL key signals reuse. */ + if (key == NULL && key_len == 0) { + key = dummy_key; + } + + if (!HMAC_Init_ex(c, key, key_len, evp_md, NULL)) + goto err; + if (!HMAC_Update(c, d, n)) + goto err; + if (!HMAC_Final(c, md, md_len)) + goto err; + HMAC_CTX_free(c); + return md; + err: + HMAC_CTX_free(c); + return NULL; +} +void HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags) +{ + EVP_MD_CTX_set_flags(ctx->i_ctx, flags); + EVP_MD_CTX_set_flags(ctx->o_ctx, flags); + EVP_MD_CTX_set_flags(ctx->md_ctx, flags); +}