diff options
Diffstat (limited to 'src/crypto/evp/p_hmac.c')
| -rw-r--r-- | src/crypto/evp/p_hmac.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/src/crypto/evp/p_hmac.c b/src/crypto/evp/p_hmac.c new file mode 100644 index 0000000..7d3254a --- /dev/null +++ b/src/crypto/evp/p_hmac.c @@ -0,0 +1,223 @@ +/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL + * project 2007. + */ +/* ==================================================================== + * Copyright (c) 2007 The OpenSSL Project. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. All advertising materials mentioning features or use of this + * software must display the following acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * licensing@OpenSSL.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT 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. + * ==================================================================== + * + * This product includes cryptographic software written by Eric Young + * (eay@cryptsoft.com). This product includes software written by Tim + * Hudson (tjh@cryptsoft.com). */ + +#include <openssl/evp.h> + +#include <string.h> + +#include <openssl/asn1.h> +#include <openssl/err.h> +#include <openssl/hmac.h> +#include <openssl/mem.h> +#include <openssl/obj.h> + +#include "internal.h" +#include "../digest/internal.h" + + +typedef struct { + const EVP_MD *md; /* MD for HMAC use */ + ASN1_OCTET_STRING ktmp; /* Temp storage for key */ + HMAC_CTX ctx; +} HMAC_PKEY_CTX; + +static int pkey_hmac_init(EVP_PKEY_CTX *ctx) { + HMAC_PKEY_CTX *hctx; + hctx = OPENSSL_malloc(sizeof(HMAC_PKEY_CTX)); + if (!hctx) { + return 0; + } + memset(hctx, 0, sizeof(HMAC_PKEY_CTX)); + hctx->ktmp.type = V_ASN1_OCTET_STRING; + HMAC_CTX_init(&hctx->ctx); + + ctx->data = hctx; + + return 1; +} + +static int pkey_hmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) { + HMAC_PKEY_CTX *sctx, *dctx; + if (!pkey_hmac_init(dst)) { + return 0; + } + sctx = src->data; + dctx = dst->data; + dctx->md = sctx->md; + HMAC_CTX_init(&dctx->ctx); + if (!HMAC_CTX_copy_ex(&dctx->ctx, &sctx->ctx)) { + return 0; + } + if (sctx->ktmp.data) { + if (!ASN1_OCTET_STRING_set(&dctx->ktmp, sctx->ktmp.data, + sctx->ktmp.length)) { + return 0; + } + } + return 1; +} + +static void pkey_hmac_cleanup(EVP_PKEY_CTX *ctx) { + HMAC_PKEY_CTX *hctx = ctx->data; + + if (hctx == NULL) { + return; + } + + HMAC_CTX_cleanup(&hctx->ctx); + if (hctx->ktmp.data) { + if (hctx->ktmp.length) { + OPENSSL_cleanse(hctx->ktmp.data, hctx->ktmp.length); + } + OPENSSL_free(hctx->ktmp.data); + hctx->ktmp.data = NULL; + } + OPENSSL_free(hctx); +} + +static int pkey_hmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) { + ASN1_OCTET_STRING *hkey = NULL; + HMAC_PKEY_CTX *hctx = ctx->data; + + if (!hctx->ktmp.data) { + return 0; + } + hkey = ASN1_OCTET_STRING_dup(&hctx->ktmp); + if (!hkey) { + return 0; + } + EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, hkey); + + return 1; +} + +static void int_update(EVP_MD_CTX *ctx, const void *data, size_t count) { + HMAC_PKEY_CTX *hctx = ctx->pctx->data; + HMAC_Update(&hctx->ctx, data, count); +} + +static int hmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx) { + /* |mctx| gets repurposed as a hook to call |HMAC_Update|. Suppress the + * automatic setting of |mctx->update| and the rest of its initialization. */ + EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT); + mctx->update = int_update; + return 1; +} + +static int hmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen, + EVP_MD_CTX *mctx) { + unsigned int hlen; + HMAC_PKEY_CTX *hctx = ctx->data; + size_t md_size = EVP_MD_CTX_size(mctx); + + if (!sig) { + *siglen = md_size; + return 1; + } else if (*siglen < md_size) { + OPENSSL_PUT_ERROR(EVP, hmac_signctx, EVP_R_BUFFER_TOO_SMALL); + return 0; + } + + if (!HMAC_Final(&hctx->ctx, sig, &hlen)) { + return 0; + } + *siglen = (size_t)hlen; + return 1; +} + +static int pkey_hmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) { + HMAC_PKEY_CTX *hctx = ctx->data; + ASN1_OCTET_STRING *key; + + switch (type) { + case EVP_PKEY_CTRL_SET_MAC_KEY: + if ((!p2 && p1 > 0) || (p1 < -1)) { + return 0; + } + if (!ASN1_OCTET_STRING_set(&hctx->ktmp, p2, p1)) { + return 0; + } + break; + + case EVP_PKEY_CTRL_MD: + hctx->md = p2; + break; + + case EVP_PKEY_CTRL_DIGESTINIT: + key = (ASN1_OCTET_STRING *)ctx->pkey->pkey.ptr; + if (!HMAC_Init_ex(&hctx->ctx, key->data, key->length, hctx->md, + ctx->engine)) { + return 0; + } + break; + + default: + OPENSSL_PUT_ERROR(EVP, pkey_hmac_ctrl, EVP_R_COMMAND_NOT_SUPPORTED); + return 0; + } + return 1; +} + +const EVP_PKEY_METHOD hmac_pkey_meth = { + EVP_PKEY_HMAC, 0 /* flags */, pkey_hmac_init, + pkey_hmac_copy, pkey_hmac_cleanup, 0 /* paramgen_init */, + 0 /* paramgen */, 0 /* keygen_init */, pkey_hmac_keygen, + 0 /* sign_init */, 0 /* sign */, 0 /* verify_init */, + 0 /* verify */, hmac_signctx_init, hmac_signctx, + 0 /* verifyctx_init */, 0 /* verifyctx */, 0 /* encrypt_init */, + 0 /* encrypt */, 0 /* decrypt_init */, 0 /* decrypt */, + 0 /* derive_init */, 0 /* derive */, pkey_hmac_ctrl, + 0, +}; |