mirror of
https://github.com/nginx/nginx.git
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295 lines
9.5 KiB
C
295 lines
9.5 KiB
C
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/*
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* Copyright (C) Maxim Dounin
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* Copyright (C) Nginx, Inc.
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*
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* An internal SHA1 implementation.
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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_sha1.h>
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static const u_char *ngx_sha1_body(ngx_sha1_t *ctx, const u_char *data,
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size_t size);
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void
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ngx_sha1_init(ngx_sha1_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->e = 0xc3d2e1f0;
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ctx->bytes = 0;
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}
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void
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ngx_sha1_update(ngx_sha1_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_sha1_body(ctx, ctx->buffer, 64);
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}
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if (size >= 64) {
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data = ngx_sha1_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_sha1_final(u_char result[20], ngx_sha1_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_sha1_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 >> 56);
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ctx->buffer[57] = (u_char) (ctx->bytes >> 48);
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ctx->buffer[58] = (u_char) (ctx->bytes >> 40);
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ctx->buffer[59] = (u_char) (ctx->bytes >> 32);
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ctx->buffer[60] = (u_char) (ctx->bytes >> 24);
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ctx->buffer[61] = (u_char) (ctx->bytes >> 16);
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ctx->buffer[62] = (u_char) (ctx->bytes >> 8);
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ctx->buffer[63] = (u_char) ctx->bytes;
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(void) ngx_sha1_body(ctx, ctx->buffer, 64);
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result[0] = (u_char) (ctx->a >> 24);
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result[1] = (u_char) (ctx->a >> 16);
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result[2] = (u_char) (ctx->a >> 8);
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result[3] = (u_char) ctx->a;
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result[4] = (u_char) (ctx->b >> 24);
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result[5] = (u_char) (ctx->b >> 16);
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result[6] = (u_char) (ctx->b >> 8);
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result[7] = (u_char) ctx->b;
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result[8] = (u_char) (ctx->c >> 24);
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result[9] = (u_char) (ctx->c >> 16);
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result[10] = (u_char) (ctx->c >> 8);
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result[11] = (u_char) ctx->c;
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result[12] = (u_char) (ctx->d >> 24);
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result[13] = (u_char) (ctx->d >> 16);
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result[14] = (u_char) (ctx->d >> 8);
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result[15] = (u_char) ctx->d;
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result[16] = (u_char) (ctx->e >> 24);
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result[17] = (u_char) (ctx->e >> 16);
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result[18] = (u_char) (ctx->e >> 8);
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result[19] = (u_char) ctx->e;
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ngx_memzero(ctx, sizeof(*ctx));
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}
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/*
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* Helper functions.
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*/
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#define ROTATE(bits, word) (((word) << (bits)) | ((word) >> (32 - (bits))))
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#define F1(b, c, d) (((b) & (c)) | ((~(b)) & (d)))
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#define F2(b, c, d) ((b) ^ (c) ^ (d))
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#define F3(b, c, d) (((b) & (c)) | ((b) & (d)) | ((c) & (d)))
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#define STEP(f, a, b, c, d, e, w, t) \
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temp = ROTATE(5, (a)) + f((b), (c), (d)) + (e) + (w) + (t); \
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(e) = (d); \
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(d) = (c); \
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(c) = ROTATE(30, (b)); \
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(b) = (a); \
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(a) = temp;
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/*
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* GET() reads 4 input bytes in big-endian byte order and returns
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* them as uint32_t.
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*/
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#define GET(n) \
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((uint32_t) p[n * 4 + 3] | \
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((uint32_t) p[n * 4 + 2] << 8) | \
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((uint32_t) p[n * 4 + 1] << 16) | \
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((uint32_t) p[n * 4] << 24))
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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_sha1_body(ngx_sha1_t *ctx, const u_char *data, size_t size)
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{
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uint32_t a, b, c, d, e, temp;
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uint32_t saved_a, saved_b, saved_c, saved_d, saved_e;
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uint32_t words[80];
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ngx_uint_t i;
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const u_char *p;
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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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e = ctx->e;
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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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saved_e = e;
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/* Load data block into the words array */
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for (i = 0; i < 16; i++) {
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words[i] = GET(i);
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}
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for (i = 16; i < 80; i++) {
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words[i] = ROTATE(1, words[i - 3] ^ words[i - 8] ^ words[i - 14]
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^ words[i - 16]);
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}
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/* Transformations */
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STEP(F1, a, b, c, d, e, words[0], 0x5a827999);
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STEP(F1, a, b, c, d, e, words[1], 0x5a827999);
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STEP(F1, a, b, c, d, e, words[2], 0x5a827999);
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STEP(F1, a, b, c, d, e, words[3], 0x5a827999);
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STEP(F1, a, b, c, d, e, words[4], 0x5a827999);
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STEP(F1, a, b, c, d, e, words[5], 0x5a827999);
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STEP(F1, a, b, c, d, e, words[6], 0x5a827999);
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STEP(F1, a, b, c, d, e, words[7], 0x5a827999);
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STEP(F1, a, b, c, d, e, words[8], 0x5a827999);
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STEP(F1, a, b, c, d, e, words[9], 0x5a827999);
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STEP(F1, a, b, c, d, e, words[10], 0x5a827999);
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STEP(F1, a, b, c, d, e, words[11], 0x5a827999);
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STEP(F1, a, b, c, d, e, words[12], 0x5a827999);
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STEP(F1, a, b, c, d, e, words[13], 0x5a827999);
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STEP(F1, a, b, c, d, e, words[14], 0x5a827999);
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STEP(F1, a, b, c, d, e, words[15], 0x5a827999);
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STEP(F1, a, b, c, d, e, words[16], 0x5a827999);
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STEP(F1, a, b, c, d, e, words[17], 0x5a827999);
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STEP(F1, a, b, c, d, e, words[18], 0x5a827999);
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STEP(F1, a, b, c, d, e, words[19], 0x5a827999);
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STEP(F2, a, b, c, d, e, words[20], 0x6ed9eba1);
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STEP(F2, a, b, c, d, e, words[21], 0x6ed9eba1);
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STEP(F2, a, b, c, d, e, words[22], 0x6ed9eba1);
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STEP(F2, a, b, c, d, e, words[23], 0x6ed9eba1);
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STEP(F2, a, b, c, d, e, words[24], 0x6ed9eba1);
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STEP(F2, a, b, c, d, e, words[25], 0x6ed9eba1);
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STEP(F2, a, b, c, d, e, words[26], 0x6ed9eba1);
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STEP(F2, a, b, c, d, e, words[27], 0x6ed9eba1);
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STEP(F2, a, b, c, d, e, words[28], 0x6ed9eba1);
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STEP(F2, a, b, c, d, e, words[29], 0x6ed9eba1);
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STEP(F2, a, b, c, d, e, words[30], 0x6ed9eba1);
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STEP(F2, a, b, c, d, e, words[31], 0x6ed9eba1);
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STEP(F2, a, b, c, d, e, words[32], 0x6ed9eba1);
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STEP(F2, a, b, c, d, e, words[33], 0x6ed9eba1);
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STEP(F2, a, b, c, d, e, words[34], 0x6ed9eba1);
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STEP(F2, a, b, c, d, e, words[35], 0x6ed9eba1);
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STEP(F2, a, b, c, d, e, words[36], 0x6ed9eba1);
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STEP(F2, a, b, c, d, e, words[37], 0x6ed9eba1);
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STEP(F2, a, b, c, d, e, words[38], 0x6ed9eba1);
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STEP(F2, a, b, c, d, e, words[39], 0x6ed9eba1);
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STEP(F3, a, b, c, d, e, words[40], 0x8f1bbcdc);
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STEP(F3, a, b, c, d, e, words[41], 0x8f1bbcdc);
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STEP(F3, a, b, c, d, e, words[42], 0x8f1bbcdc);
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STEP(F3, a, b, c, d, e, words[43], 0x8f1bbcdc);
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STEP(F3, a, b, c, d, e, words[44], 0x8f1bbcdc);
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STEP(F3, a, b, c, d, e, words[45], 0x8f1bbcdc);
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STEP(F3, a, b, c, d, e, words[46], 0x8f1bbcdc);
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STEP(F3, a, b, c, d, e, words[47], 0x8f1bbcdc);
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STEP(F3, a, b, c, d, e, words[48], 0x8f1bbcdc);
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STEP(F3, a, b, c, d, e, words[49], 0x8f1bbcdc);
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STEP(F3, a, b, c, d, e, words[50], 0x8f1bbcdc);
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STEP(F3, a, b, c, d, e, words[51], 0x8f1bbcdc);
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STEP(F3, a, b, c, d, e, words[52], 0x8f1bbcdc);
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STEP(F3, a, b, c, d, e, words[53], 0x8f1bbcdc);
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STEP(F3, a, b, c, d, e, words[54], 0x8f1bbcdc);
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STEP(F3, a, b, c, d, e, words[55], 0x8f1bbcdc);
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STEP(F3, a, b, c, d, e, words[56], 0x8f1bbcdc);
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STEP(F3, a, b, c, d, e, words[57], 0x8f1bbcdc);
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STEP(F3, a, b, c, d, e, words[58], 0x8f1bbcdc);
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STEP(F3, a, b, c, d, e, words[59], 0x8f1bbcdc);
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STEP(F2, a, b, c, d, e, words[60], 0xca62c1d6);
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STEP(F2, a, b, c, d, e, words[61], 0xca62c1d6);
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STEP(F2, a, b, c, d, e, words[62], 0xca62c1d6);
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STEP(F2, a, b, c, d, e, words[63], 0xca62c1d6);
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STEP(F2, a, b, c, d, e, words[64], 0xca62c1d6);
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STEP(F2, a, b, c, d, e, words[65], 0xca62c1d6);
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STEP(F2, a, b, c, d, e, words[66], 0xca62c1d6);
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STEP(F2, a, b, c, d, e, words[67], 0xca62c1d6);
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STEP(F2, a, b, c, d, e, words[68], 0xca62c1d6);
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STEP(F2, a, b, c, d, e, words[69], 0xca62c1d6);
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STEP(F2, a, b, c, d, e, words[70], 0xca62c1d6);
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STEP(F2, a, b, c, d, e, words[71], 0xca62c1d6);
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STEP(F2, a, b, c, d, e, words[72], 0xca62c1d6);
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STEP(F2, a, b, c, d, e, words[73], 0xca62c1d6);
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STEP(F2, a, b, c, d, e, words[74], 0xca62c1d6);
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STEP(F2, a, b, c, d, e, words[75], 0xca62c1d6);
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STEP(F2, a, b, c, d, e, words[76], 0xca62c1d6);
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STEP(F2, a, b, c, d, e, words[77], 0xca62c1d6);
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STEP(F2, a, b, c, d, e, words[78], 0xca62c1d6);
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STEP(F2, a, b, c, d, e, words[79], 0xca62c1d6);
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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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e += saved_e;
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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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ctx->e = e;
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return p;
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}
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