279 lines
9.0 KiB
C
279 lines
9.0 KiB
C
/****************************************************************************
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* crypto/md5.c
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* $OpenBSD: md5.c,v 1.4 2014/12/28 10:04:35 tedu Exp $
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*
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* This code implements the MD5 message-digest algorithm.
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* The algorithm is due to Ron Rivest. This code was
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* written by Colin Plumb in 1993, no copyright is claimed.
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* This code is in the public domain; do with it what you wish.
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*
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* Equivalent code is available from RSA Data Security, Inc.
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* This code has been tested against that, and is equivalent,
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* except that you don't need to include two pages of legalese
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* with every copy.
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*
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* To compute the message digest of a chunk of bytes, declare an
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* MD5Context structure, pass it to MD5Init, call MD5Update as
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* needed on buffers full of bytes, and then call MD5Final, which
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* will fill a supplied 16-byte array with the digest.
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <crypto/md5.h>
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#define PUT_64BIT_LE(cp, value) \
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do \
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{ \
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(cp)[7] = (value) >> 56; \
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(cp)[6] = (value) >> 48; \
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(cp)[5] = (value) >> 40; \
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(cp)[4] = (value) >> 32; \
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(cp)[3] = (value) >> 24; \
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(cp)[2] = (value) >> 16; \
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(cp)[1] = (value) >> 8; \
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(cp)[0] = (value); \
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} \
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while (0)
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#define PUT_32BIT_LE(cp, value) \
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do \
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{ \
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(cp)[3] = (value) >> 24; \
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(cp)[2] = (value) >> 16; \
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(cp)[1] = (value) >> 8; \
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(cp)[0] = (value); \
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} \
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while (0)
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static uint8_t PADDING[MD5_BLOCK_LENGTH] =
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{
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0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/* Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
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* initialization constants.
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*/
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void md5init(FAR MD5_CTX *ctx)
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{
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ctx->count = 0;
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ctx->state[0] = 0x67452301;
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ctx->state[1] = 0xefcdab89;
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ctx->state[2] = 0x98badcfe;
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ctx->state[3] = 0x10325476;
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}
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/* Update context to reflect the concatenation of another buffer full
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* of bytes.
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*/
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void md5update(FAR MD5_CTX *ctx, FAR const void *inputptr, size_t len)
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{
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FAR const uint8_t *input = inputptr;
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size_t have;
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size_t need;
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/* Check how many bytes we already have and how many more we need. */
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have = (size_t)((ctx->count >> 3) & (MD5_BLOCK_LENGTH - 1));
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need = MD5_BLOCK_LENGTH - have;
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/* Update bitcount */
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ctx->count += (uint64_t)len << 3;
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if (len >= need)
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{
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if (have != 0)
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{
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memcpy(ctx->buffer + have, input, need);
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md5transform(ctx->state, ctx->buffer);
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input += need;
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len -= need;
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have = 0;
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}
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/* Process data in MD5_BLOCK_LENGTH-byte chunks. */
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while (len >= MD5_BLOCK_LENGTH)
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{
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md5transform(ctx->state, input);
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input += MD5_BLOCK_LENGTH;
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len -= MD5_BLOCK_LENGTH;
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}
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}
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/* Handle any remaining bytes of data. */
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if (len != 0)
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{
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memcpy(ctx->buffer + have, input, len);
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}
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}
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/* Final wrapup - pad to 64-byte boundary with the bit pattern
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* 1 0* (64-bit count of bits processed, MSB-first)
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*/
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void md5final(FAR unsigned char *digest, FAR MD5_CTX *ctx)
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{
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uint8_t count[8];
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size_t padlen;
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int i;
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/* Convert count to 8 bytes in little endian order. */
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PUT_64BIT_LE(count, ctx->count);
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/* Pad out to 56 mod 64. */
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padlen = MD5_BLOCK_LENGTH -
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((ctx->count >> 3) & (MD5_BLOCK_LENGTH - 1));
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if (padlen < 1 + 8)
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{
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padlen += MD5_BLOCK_LENGTH;
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}
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md5update(ctx, PADDING, padlen - 8); /* padlen - 8 <= 64 */
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md5update(ctx, count, 8);
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for (i = 0; i < 4; i++)
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{
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PUT_32BIT_LE(digest + i * 4, ctx->state[i]);
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}
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explicit_bzero(ctx, sizeof(*ctx)); /* in case it's sensitive */
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}
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/* The four core functions - F1 is optimized somewhat */
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/* #define F1(x, y, z) (x & y | ~x & z) */
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#define F1(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
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#define F2(x, y, z) F1(z, x, y)
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#define F3(x, y, z) ((x) ^ (y) ^ (z))
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#define F4(x, y, z) ((y) ^ ((x) | ~(z)))
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/* This is the central step in the MD5 algorithm. */
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#define MD5STEP(f, w, x, y, z, data, s) \
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((w) += f(x, y, z) + (data), \
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(w) = (w) << (s) | (w) >> (32 - (s)), \
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(w) += (x))
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/* The core of the MD5 algorithm, this alters an existing MD5 hash to
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* reflect the addition of 16 longwords of new data. MD5Update blocks
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* the data and converts bytes into longwords for this routine.
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*/
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void md5transform(FAR uint32_t *state, FAR const uint8_t *block)
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{
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uint32_t a;
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uint32_t b;
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uint32_t c;
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uint32_t d;
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uint32_t in[MD5_BLOCK_LENGTH / 4];
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#if BYTE_ORDER == LITTLE_ENDIAN
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memcpy(in, block, sizeof(in));
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#else
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for (a = 0; a < MD5_BLOCK_LENGTH / 4; a++)
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{
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in[a] = (uint32_t)(
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(uint32_t)(block[a * 4 + 0]) |
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(uint32_t)(block[a * 4 + 1]) << 8 |
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(uint32_t)(block[a * 4 + 2]) << 16 |
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(uint32_t)(block[a * 4 + 3]) << 24);
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}
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#endif
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a = state[0];
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b = state[1];
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c = state[2];
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d = state[3];
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MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
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MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
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MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
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MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
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MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
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MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
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MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
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MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
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MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
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MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
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MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
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MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
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MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
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MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
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MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
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MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
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MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
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MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
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MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
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MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
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MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
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MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
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MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
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MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
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MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
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MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
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MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
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MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
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MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
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MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
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MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
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MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
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MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
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MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
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MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
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MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
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MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
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MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
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MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
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MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
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MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
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MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
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MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
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MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
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MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
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MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
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MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
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MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
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MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
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MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
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MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
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MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
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MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
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MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
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MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
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MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
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MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
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MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
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MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
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MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
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MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
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MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
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MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
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MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
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state[0] += a;
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state[1] += b;
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state[2] += c;
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state[3] += d;
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}
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