feat: implement step 3 & 4
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3940ee3a21
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76a685d1b7
1 changed files with 24 additions and 1 deletions
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@ -51,7 +51,7 @@ void md2_hash(size_t len, const uint8_t buf[len], uint8_t out[16]) {
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printf("len: %d\n", len);
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uint8_t* newBuf = malloc(len + 16); // 16 = Checksum
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uint8_t* newBuf = calloc(len + 16, sizeof(uint8_t)); // +16 = Checksum
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memcpy(newBuf, buf, len - paddingNeeded);
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newBuf[4] = 'f';
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@ -65,5 +65,28 @@ void md2_hash(size_t len, const uint8_t buf[len], uint8_t out[16]) {
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printBuf(len + 16, newBuf);
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// implement step 3
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u_int8_t messageDigestBuf = calloc(48, sizeof(uint8_t));
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for (int i = 0; i <= len / 16; i++) { // <= because we need to hash the last block too
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for (int j = 0; j < 16; j++) {
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messageDigestBuf[16 + j] = newBuf[i * 16 + j];
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messageDigestBuf[32 + j] = (newBuf[16 + j] ^ messageDigestBuf[j]);
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}
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u_int8_t t = 0;
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for (int j = 0; j < 18; j++) {
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for (int k = 0; k < 48; k++) {
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t = messageDigestBuf[k] = messageDigestBuf[k] ^ PI_SUBST[t];
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}
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t = (t + j) % 256;
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}
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}
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printf("messageDigestBuf: \n");
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printBuf(16, messageDigestBuf);
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free(messageDigestBuf);
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free(newBuf);
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}
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