mirror of https://gitlab.com/octospacc/SmolOTP.git
34 lines
729 B
C
34 lines
729 B
C
#include "hmac.h"
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/* function doing the HMAC-SHA-1 calculation */
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void hmac_sha1(const uint8_t* key, const uint32_t keysize, const uint8_t* msg, const uint32_t msgsize, uint8_t* output)
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{
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struct sha1 outer, inner;
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uint8_t tmp;
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sha1_reset(&outer);
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sha1_reset(&inner);
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uint32_t i;
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for (i = 0; i < keysize; ++i)
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{
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tmp = key[i] ^ 0x5C;
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sha1_input(&outer, &tmp, 1);
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tmp = key[i] ^ 0x36;
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sha1_input(&inner, &tmp, 1);
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}
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for (; i < 64; ++i)
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{
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tmp = 0x5C;
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sha1_input(&outer, &tmp, 1);
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tmp = 0x36;
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sha1_input(&inner, &tmp, 1);
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}
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sha1_input(&inner, msg, msgsize);
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sha1_result(&inner, output);
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sha1_input(&outer, output, HMAC_SHA1_HASH_SIZE);
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sha1_result(&outer, output);
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}
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