GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libc/hash/sha1.c Lines: 64 64 100.0 %
Date: 2017-11-07 Branches: 10 10 100.0 %

Line Branch Exec Source
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/*	$OpenBSD: sha1.c,v 1.26 2015/09/11 09:18:27 guenther Exp $	*/
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/*
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 * SHA-1 in C
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 * By Steve Reid <steve@edmweb.com>
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 * 100% Public Domain
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 *
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 * Test Vectors (from FIPS PUB 180-1)
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 * "abc"
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 *   A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
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 * "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
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 *   84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
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 * A million repetitions of "a"
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 *   34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
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 */
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#include <sys/types.h>
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#include <string.h>
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#include <sha1.h>
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#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
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/*
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 * blk0() and blk() perform the initial expand.
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 * I got the idea of expanding during the round function from SSLeay
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 */
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#if BYTE_ORDER == LITTLE_ENDIAN
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# define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
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    |(rol(block->l[i],8)&0x00FF00FF))
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#else
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# define blk0(i) block->l[i]
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#endif
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#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
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    ^block->l[(i+2)&15]^block->l[i&15],1))
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/*
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 * (R0+R1), R2, R3, R4 are the different operations (rounds) used in SHA1
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 */
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#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
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#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
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#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
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#define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
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#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
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typedef union {
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	u_int8_t c[64];
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	u_int32_t l[16];
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} CHAR64LONG16;
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/*
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 * Hash a single 512-bit block. This is the core of the algorithm.
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 */
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void
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SHA1Transform(u_int32_t state[5], const u_int8_t buffer[SHA1_BLOCK_LENGTH])
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{
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	u_int32_t a, b, c, d, e;
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	u_int8_t workspace[SHA1_BLOCK_LENGTH];
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	CHAR64LONG16 *block = (CHAR64LONG16 *)workspace;
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312740
	(void)memcpy(block, buffer, SHA1_BLOCK_LENGTH);
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	/* Copy context->state[] to working vars */
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156370
	a = state[0];
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156370
	b = state[1];
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156370
	c = state[2];
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	d = state[3];
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156370
	e = state[4];
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	/* 4 rounds of 20 operations each. Loop unrolled. */
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156370
	R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
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156370
	R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
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156370
	R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
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156370
	R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
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156370
	R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
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156370
	R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
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156370
	R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
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156370
	R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
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156370
	R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
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156370
	R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
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156370
	R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
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156370
	R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
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156370
	R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
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156370
	R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
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	R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
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	R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
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	R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
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156370
	R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
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	R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
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156370
	R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);
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	/* Add the working vars back into context.state[] */
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156370
	state[0] += a;
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	state[1] += b;
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	state[2] += c;
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156370
	state[3] += d;
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	state[4] += e;
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	/* Wipe variables */
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	a = b = c = d = e = 0;
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156370
}
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DEF_WEAK(SHA1Transform);
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/*
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 * SHA1Init - Initialize new context
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 */
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void
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SHA1Init(SHA1_CTX *context)
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{
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	/* SHA1 initialization constants */
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	context->count = 0;
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	context->state[0] = 0x67452301;
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	context->state[1] = 0xEFCDAB89;
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	context->state[2] = 0x98BADCFE;
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	context->state[3] = 0x10325476;
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	context->state[4] = 0xC3D2E1F0;
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}
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DEF_WEAK(SHA1Init);
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/*
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 * Run your data through this.
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 */
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void
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SHA1Update(SHA1_CTX *context, const u_int8_t *data, size_t len)
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{
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	size_t i, j;
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	j = (size_t)((context->count >> 3) & 63);
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14710
	context->count += (len << 3);
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	if ((j + len) > 63) {
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		(void)memcpy(&context->buffer[j], data, (i = 64-j));
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		SHA1Transform(context->state, context->buffer);
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312740
		for ( ; i + 63 < len; i += 64)
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			SHA1Transform(context->state, (u_int8_t *)&data[i]);
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		j = 0;
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	} else {
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		i = 0;
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	}
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	(void)memcpy(&context->buffer[j], &data[i], len - i);
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}
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DEF_WEAK(SHA1Update);
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/*
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 * Add padding and return the message digest.
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 */
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void
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SHA1Pad(SHA1_CTX *context)
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{
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	u_int8_t finalcount[8];
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	u_int i;
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	for (i = 0; i < 8; i++) {
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		finalcount[i] = (u_int8_t)((context->count >>
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		    ((7 - (i & 7)) * 8)) & 255);	/* Endian independent */
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	}
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	SHA1Update(context, (u_int8_t *)"\200", 1);
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	while ((context->count & 504) != 448)
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		SHA1Update(context, (u_int8_t *)"\0", 1);
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	SHA1Update(context, finalcount, 8); /* Should cause a SHA1Transform() */
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}
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DEF_WEAK(SHA1Pad);
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void
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SHA1Final(u_int8_t digest[SHA1_DIGEST_LENGTH], SHA1_CTX *context)
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{
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	u_int i;
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	SHA1Pad(context);
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	for (i = 0; i < SHA1_DIGEST_LENGTH; i++) {
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		digest[i] = (u_int8_t)
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		   ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
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	}
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	explicit_bzero(context, sizeof(*context));
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}
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DEF_WEAK(SHA1Final);