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c60b61a290
This reduces the number of moving parts in ABI compatibility checks. Additionally, it also allows to use OpenSSL in FIPS mode while still using md5 for non-security tasks.
284 lines
8.4 KiB
C
284 lines
8.4 KiB
C
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/*
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* An internal implementation, based on Alexander Peslyak's
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* public domain implementation:
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* http://openwall.info/wiki/people/solar/software/public-domain-source-code/md5
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_md5.h>
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static const u_char *ngx_md5_body(ngx_md5_t *ctx, const u_char *data,
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size_t size);
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void
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ngx_md5_init(ngx_md5_t *ctx)
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{
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ctx->a = 0x67452301;
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ctx->b = 0xefcdab89;
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ctx->c = 0x98badcfe;
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ctx->d = 0x10325476;
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ctx->bytes = 0;
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}
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void
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ngx_md5_update(ngx_md5_t *ctx, const void *data, size_t size)
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{
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size_t used, free;
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used = (size_t) (ctx->bytes & 0x3f);
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ctx->bytes += size;
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if (used) {
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free = 64 - used;
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if (size < free) {
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ngx_memcpy(&ctx->buffer[used], data, size);
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return;
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}
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ngx_memcpy(&ctx->buffer[used], data, free);
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data = (u_char *) data + free;
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size -= free;
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(void) ngx_md5_body(ctx, ctx->buffer, 64);
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}
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if (size >= 64) {
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data = ngx_md5_body(ctx, data, size & ~(size_t) 0x3f);
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size &= 0x3f;
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}
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ngx_memcpy(ctx->buffer, data, size);
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}
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void
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ngx_md5_final(u_char result[16], ngx_md5_t *ctx)
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{
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size_t used, free;
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used = (size_t) (ctx->bytes & 0x3f);
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ctx->buffer[used++] = 0x80;
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free = 64 - used;
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if (free < 8) {
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ngx_memzero(&ctx->buffer[used], free);
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(void) ngx_md5_body(ctx, ctx->buffer, 64);
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used = 0;
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free = 64;
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}
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ngx_memzero(&ctx->buffer[used], free - 8);
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ctx->bytes <<= 3;
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ctx->buffer[56] = (u_char) ctx->bytes;
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ctx->buffer[57] = (u_char) (ctx->bytes >> 8);
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ctx->buffer[58] = (u_char) (ctx->bytes >> 16);
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ctx->buffer[59] = (u_char) (ctx->bytes >> 24);
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ctx->buffer[60] = (u_char) (ctx->bytes >> 32);
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ctx->buffer[61] = (u_char) (ctx->bytes >> 40);
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ctx->buffer[62] = (u_char) (ctx->bytes >> 48);
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ctx->buffer[63] = (u_char) (ctx->bytes >> 56);
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(void) ngx_md5_body(ctx, ctx->buffer, 64);
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result[0] = (u_char) ctx->a;
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result[1] = (u_char) (ctx->a >> 8);
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result[2] = (u_char) (ctx->a >> 16);
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result[3] = (u_char) (ctx->a >> 24);
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result[4] = (u_char) ctx->b;
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result[5] = (u_char) (ctx->b >> 8);
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result[6] = (u_char) (ctx->b >> 16);
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result[7] = (u_char) (ctx->b >> 24);
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result[8] = (u_char) ctx->c;
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result[9] = (u_char) (ctx->c >> 8);
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result[10] = (u_char) (ctx->c >> 16);
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result[11] = (u_char) (ctx->c >> 24);
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result[12] = (u_char) ctx->d;
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result[13] = (u_char) (ctx->d >> 8);
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result[14] = (u_char) (ctx->d >> 16);
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result[15] = (u_char) (ctx->d >> 24);
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ngx_memzero(ctx, sizeof(*ctx));
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}
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/*
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* The basic MD5 functions.
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*
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* F and G are optimized compared to their RFC 1321 definitions for
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* architectures that lack an AND-NOT instruction, just like in
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* Colin Plumb's implementation.
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*/
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#define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
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#define G(x, y, z) ((y) ^ ((z) & ((x) ^ (y))))
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#define H(x, y, z) ((x) ^ (y) ^ (z))
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#define I(x, y, z) ((y) ^ ((x) | ~(z)))
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/*
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* The MD5 transformation for all four rounds.
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*/
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#define STEP(f, a, b, c, d, x, t, s) \
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(a) += f((b), (c), (d)) + (x) + (t); \
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(a) = (((a) << (s)) | (((a) & 0xffffffff) >> (32 - (s)))); \
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(a) += (b)
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/*
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* SET() reads 4 input bytes in little-endian byte order and stores them
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* in a properly aligned word in host byte order.
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*
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* The check for little-endian architectures that tolerate unaligned
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* memory accesses is just an optimization. Nothing will break if it
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* does not work.
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*/
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#if (NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED)
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#define SET(n) (*(uint32_t *) &p[n * 4])
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#define GET(n) (*(uint32_t *) &p[n * 4])
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#else
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#define SET(n) \
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(block[n] = \
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(uint32_t) p[n * 4] | \
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((uint32_t) p[n * 4 + 1] << 8) | \
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((uint32_t) p[n * 4 + 2] << 16) | \
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((uint32_t) p[n * 4 + 3] << 24))
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#define GET(n) block[n]
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#endif
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/*
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* This processes one or more 64-byte data blocks, but does not update
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* the bit counters. There are no alignment requirements.
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*/
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static const u_char *
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ngx_md5_body(ngx_md5_t *ctx, const u_char *data, size_t size)
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{
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uint32_t a, b, c, d;
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uint32_t saved_a, saved_b, saved_c, saved_d;
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const u_char *p;
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#if !(NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED)
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uint32_t block[16];
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#endif
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p = data;
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a = ctx->a;
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b = ctx->b;
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c = ctx->c;
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d = ctx->d;
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do {
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saved_a = a;
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saved_b = b;
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saved_c = c;
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saved_d = d;
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/* Round 1 */
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STEP(F, a, b, c, d, SET(0), 0xd76aa478, 7);
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STEP(F, d, a, b, c, SET(1), 0xe8c7b756, 12);
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STEP(F, c, d, a, b, SET(2), 0x242070db, 17);
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STEP(F, b, c, d, a, SET(3), 0xc1bdceee, 22);
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STEP(F, a, b, c, d, SET(4), 0xf57c0faf, 7);
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STEP(F, d, a, b, c, SET(5), 0x4787c62a, 12);
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STEP(F, c, d, a, b, SET(6), 0xa8304613, 17);
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STEP(F, b, c, d, a, SET(7), 0xfd469501, 22);
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STEP(F, a, b, c, d, SET(8), 0x698098d8, 7);
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STEP(F, d, a, b, c, SET(9), 0x8b44f7af, 12);
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STEP(F, c, d, a, b, SET(10), 0xffff5bb1, 17);
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STEP(F, b, c, d, a, SET(11), 0x895cd7be, 22);
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STEP(F, a, b, c, d, SET(12), 0x6b901122, 7);
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STEP(F, d, a, b, c, SET(13), 0xfd987193, 12);
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STEP(F, c, d, a, b, SET(14), 0xa679438e, 17);
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STEP(F, b, c, d, a, SET(15), 0x49b40821, 22);
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/* Round 2 */
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STEP(G, a, b, c, d, GET(1), 0xf61e2562, 5);
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STEP(G, d, a, b, c, GET(6), 0xc040b340, 9);
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STEP(G, c, d, a, b, GET(11), 0x265e5a51, 14);
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STEP(G, b, c, d, a, GET(0), 0xe9b6c7aa, 20);
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STEP(G, a, b, c, d, GET(5), 0xd62f105d, 5);
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STEP(G, d, a, b, c, GET(10), 0x02441453, 9);
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STEP(G, c, d, a, b, GET(15), 0xd8a1e681, 14);
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STEP(G, b, c, d, a, GET(4), 0xe7d3fbc8, 20);
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STEP(G, a, b, c, d, GET(9), 0x21e1cde6, 5);
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STEP(G, d, a, b, c, GET(14), 0xc33707d6, 9);
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STEP(G, c, d, a, b, GET(3), 0xf4d50d87, 14);
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STEP(G, b, c, d, a, GET(8), 0x455a14ed, 20);
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STEP(G, a, b, c, d, GET(13), 0xa9e3e905, 5);
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STEP(G, d, a, b, c, GET(2), 0xfcefa3f8, 9);
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STEP(G, c, d, a, b, GET(7), 0x676f02d9, 14);
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STEP(G, b, c, d, a, GET(12), 0x8d2a4c8a, 20);
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/* Round 3 */
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STEP(H, a, b, c, d, GET(5), 0xfffa3942, 4);
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STEP(H, d, a, b, c, GET(8), 0x8771f681, 11);
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STEP(H, c, d, a, b, GET(11), 0x6d9d6122, 16);
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STEP(H, b, c, d, a, GET(14), 0xfde5380c, 23);
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STEP(H, a, b, c, d, GET(1), 0xa4beea44, 4);
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STEP(H, d, a, b, c, GET(4), 0x4bdecfa9, 11);
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STEP(H, c, d, a, b, GET(7), 0xf6bb4b60, 16);
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STEP(H, b, c, d, a, GET(10), 0xbebfbc70, 23);
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STEP(H, a, b, c, d, GET(13), 0x289b7ec6, 4);
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STEP(H, d, a, b, c, GET(0), 0xeaa127fa, 11);
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STEP(H, c, d, a, b, GET(3), 0xd4ef3085, 16);
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STEP(H, b, c, d, a, GET(6), 0x04881d05, 23);
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STEP(H, a, b, c, d, GET(9), 0xd9d4d039, 4);
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STEP(H, d, a, b, c, GET(12), 0xe6db99e5, 11);
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STEP(H, c, d, a, b, GET(15), 0x1fa27cf8, 16);
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STEP(H, b, c, d, a, GET(2), 0xc4ac5665, 23);
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/* Round 4 */
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STEP(I, a, b, c, d, GET(0), 0xf4292244, 6);
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STEP(I, d, a, b, c, GET(7), 0x432aff97, 10);
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STEP(I, c, d, a, b, GET(14), 0xab9423a7, 15);
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STEP(I, b, c, d, a, GET(5), 0xfc93a039, 21);
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STEP(I, a, b, c, d, GET(12), 0x655b59c3, 6);
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STEP(I, d, a, b, c, GET(3), 0x8f0ccc92, 10);
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STEP(I, c, d, a, b, GET(10), 0xffeff47d, 15);
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STEP(I, b, c, d, a, GET(1), 0x85845dd1, 21);
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STEP(I, a, b, c, d, GET(8), 0x6fa87e4f, 6);
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STEP(I, d, a, b, c, GET(15), 0xfe2ce6e0, 10);
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STEP(I, c, d, a, b, GET(6), 0xa3014314, 15);
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STEP(I, b, c, d, a, GET(13), 0x4e0811a1, 21);
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STEP(I, a, b, c, d, GET(4), 0xf7537e82, 6);
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STEP(I, d, a, b, c, GET(11), 0xbd3af235, 10);
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STEP(I, c, d, a, b, GET(2), 0x2ad7d2bb, 15);
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STEP(I, b, c, d, a, GET(9), 0xeb86d391, 21);
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a += saved_a;
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b += saved_b;
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c += saved_c;
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d += saved_d;
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p += 64;
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} while (size -= 64);
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ctx->a = a;
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ctx->b = b;
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ctx->c = c;
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ctx->d = d;
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return p;
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}
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