55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
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#include <assert.h>
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#include "hmac_md5.h"
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#include "md5.h"
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void hmac_md5_init(WINPR_HMAC_MD5_CTX* ctx, unsigned char* key, size_t key_len)
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{
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const WINPR_HMAC_MD5_CTX empty = { 0 };
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unsigned char k_ipad[KEY_IOPAD_SIZE] = { 0 };
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unsigned char k_opad[KEY_IOPAD_SIZE] = { 0 };
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assert(ctx);
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*ctx = empty;
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if (key_len <= KEY_IOPAD_SIZE)
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{
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memcpy(k_ipad, key, key_len);
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memcpy(k_opad, key, key_len);
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}
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else
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{
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WINPR_MD5_CTX lctx = { 0 };
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winpr_MD5_Init(&lctx);
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winpr_MD5_Update(&lctx, key, key_len);
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winpr_MD5_Final(k_ipad, &lctx);
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memcpy(k_opad, k_ipad, KEY_IOPAD_SIZE);
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}
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for (size_t i = 0; i < KEY_IOPAD_SIZE; i++)
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{
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k_ipad[i] ^= 0x36;
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k_opad[i] ^= 0x5c;
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}
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winpr_MD5_Init(&ctx->icontext);
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winpr_MD5_Update(&ctx->icontext, k_ipad, KEY_IOPAD_SIZE);
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winpr_MD5_Init(&ctx->ocontext);
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winpr_MD5_Update(&ctx->ocontext, k_opad, KEY_IOPAD_SIZE);
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}
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void hmac_md5_update(WINPR_HMAC_MD5_CTX* ctx, unsigned char* text, size_t text_len)
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{
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assert(ctx);
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winpr_MD5_Update(&ctx->icontext, text, text_len);
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}
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void hmac_md5_finalize(WINPR_HMAC_MD5_CTX* ctx, unsigned char* hmac)
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{
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assert(ctx);
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winpr_MD5_Final(hmac, &ctx->icontext);
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winpr_MD5_Update(&ctx->ocontext, hmac, 16);
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winpr_MD5_Final(hmac, &ctx->ocontext);
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}
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