diff options
Diffstat (limited to 'sys/crypto/hmac.c')
| -rw-r--r-- | sys/crypto/hmac.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/sys/crypto/hmac.c b/sys/crypto/hmac.c new file mode 100644 index 00000000000..00aa18bc8de --- /dev/null +++ b/sys/crypto/hmac.c @@ -0,0 +1,192 @@ +/* $OpenBSD: hmac.c,v 1.1 2008/08/12 15:43:00 damien Exp $ */ + +/*- + * Copyright (c) 2008 Damien Bergamini <damien.bergamini@free.fr> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +/* + * This code implements the HMAC algorithm described in RFC 2104 using + * the MD5, SHA1 and SHA-256 hash functions. + */ + +#include <sys/param.h> +#include <sys/systm.h> + +#include <crypto/md5.h> +#include <crypto/sha1.h> +#include <crypto/sha2.h> +#include <crypto/hmac.h> + +void +HMAC_MD5_Init(HMAC_MD5_CTX *ctx, const u_int8_t *key, u_int key_len) +{ + u_int8_t k_ipad[MD5_BLOCK_LENGTH]; + int i; + + if (key_len > MD5_BLOCK_LENGTH) { + MD5Init(&ctx->ctx); + MD5Update(&ctx->ctx, key, key_len); + MD5Final(ctx->key, &ctx->ctx); + ctx->key_len = MD5_DIGEST_LENGTH; + } else { + bcopy(key, ctx->key, key_len); + ctx->key_len = key_len; + } + + bzero(k_ipad, MD5_BLOCK_LENGTH); + bcopy(ctx->key, k_ipad, ctx->key_len); + for (i = 0; i < MD5_BLOCK_LENGTH; i++) + k_ipad[i] ^= 0x36; + + MD5Init(&ctx->ctx); + MD5Update(&ctx->ctx, k_ipad, MD5_BLOCK_LENGTH); + + bzero(k_ipad, sizeof k_ipad); +} + +void +HMAC_MD5_Update(HMAC_MD5_CTX *ctx, const u_int8_t *data, u_int len) +{ + MD5Update(&ctx->ctx, data, len); +} + +void +HMAC_MD5_Final(u_int8_t digest[MD5_DIGEST_LENGTH], HMAC_MD5_CTX *ctx) +{ + u_int8_t k_opad[MD5_BLOCK_LENGTH]; + int i; + + MD5Final(digest, &ctx->ctx); + + bzero(k_opad, MD5_BLOCK_LENGTH); + bcopy(ctx->key, k_opad, ctx->key_len); + for (i = 0; i < MD5_BLOCK_LENGTH; i++) + k_opad[i] ^= 0x5c; + + MD5Init(&ctx->ctx); + MD5Update(&ctx->ctx, k_opad, MD5_BLOCK_LENGTH); + MD5Update(&ctx->ctx, digest, MD5_DIGEST_LENGTH); + MD5Final(digest, &ctx->ctx); + + bzero(k_opad, sizeof k_opad); +} + +void +HMAC_SHA1_Init(HMAC_SHA1_CTX *ctx, const u_int8_t *key, u_int key_len) +{ + u_int8_t k_ipad[SHA1_BLOCK_LENGTH]; + int i; + + if (key_len > SHA1_BLOCK_LENGTH) { + SHA1Init(&ctx->ctx); + SHA1Update(&ctx->ctx, key, key_len); + SHA1Final(ctx->key, &ctx->ctx); + ctx->key_len = SHA1_DIGEST_LENGTH; + } else { + bcopy(key, ctx->key, key_len); + ctx->key_len = key_len; + } + + bzero(k_ipad, SHA1_BLOCK_LENGTH); + bcopy(ctx->key, k_ipad, ctx->key_len); + for (i = 0; i < SHA1_BLOCK_LENGTH; i++) + k_ipad[i] ^= 0x36; + + SHA1Init(&ctx->ctx); + SHA1Update(&ctx->ctx, k_ipad, SHA1_BLOCK_LENGTH); + + bzero(k_ipad, sizeof k_ipad); +} + +void +HMAC_SHA1_Update(HMAC_SHA1_CTX *ctx, const u_int8_t *data, u_int len) +{ + SHA1Update(&ctx->ctx, data, len); +} + +void +HMAC_SHA1_Final(u_int8_t digest[SHA1_DIGEST_LENGTH], HMAC_SHA1_CTX *ctx) +{ + u_int8_t k_opad[SHA1_BLOCK_LENGTH]; + int i; + + SHA1Final(digest, &ctx->ctx); + + bzero(k_opad, SHA1_BLOCK_LENGTH); + bcopy(ctx->key, k_opad, ctx->key_len); + for (i = 0; i < SHA1_BLOCK_LENGTH; i++) + k_opad[i] ^= 0x5c; + + SHA1Init(&ctx->ctx); + SHA1Update(&ctx->ctx, k_opad, SHA1_BLOCK_LENGTH); + SHA1Update(&ctx->ctx, digest, SHA1_DIGEST_LENGTH); + SHA1Final(digest, &ctx->ctx); + + bzero(k_opad, sizeof k_opad); +} + +void +HMAC_SHA256_Init(HMAC_SHA256_CTX *ctx, const u_int8_t *key, u_int key_len) +{ + u_int8_t k_ipad[SHA256_BLOCK_LENGTH]; + int i; + + if (key_len > SHA256_BLOCK_LENGTH) { + SHA256_Init(&ctx->ctx); + SHA256_Update(&ctx->ctx, key, key_len); + SHA256_Final(ctx->key, &ctx->ctx); + ctx->key_len = SHA256_DIGEST_LENGTH; + } else { + bcopy(key, ctx->key, key_len); + ctx->key_len = key_len; + } + + bzero(k_ipad, SHA256_BLOCK_LENGTH); + bcopy(ctx->key, k_ipad, ctx->key_len); + for (i = 0; i < SHA256_BLOCK_LENGTH; i++) + k_ipad[i] ^= 0x36; + + SHA256_Init(&ctx->ctx); + SHA256_Update(&ctx->ctx, k_ipad, SHA256_BLOCK_LENGTH); + + bzero(k_ipad, sizeof k_ipad); +} + +void +HMAC_SHA256_Update(HMAC_SHA256_CTX *ctx, const u_int8_t *data, u_int len) +{ + SHA256_Update(&ctx->ctx, data, len); +} + +void +HMAC_SHA256_Final(u_int8_t digest[SHA256_DIGEST_LENGTH], HMAC_SHA256_CTX *ctx) +{ + u_int8_t k_opad[SHA256_BLOCK_LENGTH]; + int i; + + SHA256_Final(digest, &ctx->ctx); + + bzero(k_opad, SHA256_BLOCK_LENGTH); + bcopy(ctx->key, k_opad, ctx->key_len); + for (i = 0; i < SHA256_BLOCK_LENGTH; i++) + k_opad[i] ^= 0x5c; + + SHA256_Init(&ctx->ctx); + SHA256_Update(&ctx->ctx, k_opad, SHA256_BLOCK_LENGTH); + SHA256_Update(&ctx->ctx, digest, SHA256_DIGEST_LENGTH); + SHA256_Final(digest, &ctx->ctx); + + bzero(k_opad, sizeof k_opad); +} |