More cleanup: consistent indents, uint32_t, rename functions and structs,

argument order, etc.  Use "this" instead of "context" to annoy the c++ guys.

diff --git a/toys/sha1.c b/toys/sha1.c
index 0806d0c..4180f39 100644 (file)
--- a/toys/sha1.c
+++ b/toys/sha1.c
@@ -1,33 +1,26 @@
 /*
-SHA-1 in C
-By Steve Reid <steve@edmweb.com>
-100% Public Domain
-
-Test Vectors (from FIPS PUB 180-1)
-"abc"
-  A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
-"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
-  84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
-A million repetitions of "a"
-  34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
-*/
-
-#define LITTLE_ENDIAN /* This should be #define'd if true. */
+ * Based on the public domain SHA-1 in C by Steve Reid <steve@edmweb.com>
+ * from http://www.mirrors.wiretapped.net/security/cryptography/hashes/sha1/
+ */
+
+/* #define LITTLE_ENDIAN * This should be #define'd if true. */
 /* #define SHA1HANDSOFF * Copies data before messing with it. */
+#define        LITTLE_ENDIAN
 
 #include <stdio.h>
 #include <string.h>
+#include <inttypes.h>
 
-typedef struct {
-       unsigned int state[5];
-       unsigned int count[2];
+struct sha1 {
+       uint32_t state[5];
+       uint32_t count[2];
        unsigned char buffer[64];
-} SHA1_CTX;
+};
 
-void SHA1Transform(unsigned int state[5], unsigned char buffer[64]);
-void SHA1Init(SHA1_CTX* context);
-void SHA1Update(SHA1_CTX* context, unsigned char* data, unsigned int len);
-void SHA1Final(unsigned char digest[20], SHA1_CTX* context);
+void sha1_init(struct sha1 *this);
+void sha1_transform(unsigned int state[5], unsigned char buffer[64]);
+void sha1_update(struct sha1 *this, unsigned char *data, unsigned int len);
+void sha1_final(struct sha1 *this, unsigned char digest[20]);
 
 #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
 
@@ -49,24 +42,29 @@ void SHA1Final(unsigned char digest[20], SHA1_CTX* context);
 #define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
 #define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
 
+void printy(unsigned char *this)
+{
+       int i;
+
+       for (i = 0; i < 20; i++) printf("%02x", this[i]);
+       putchar('\n');
+}
 
 /* Hash a single 512-bit block. This is the core of the algorithm. */
 
-void SHA1Transform(unsigned int state[5], unsigned char buffer[64])
+void sha1_transform(unsigned int state[5], unsigned char buffer[64])
 {
-unsigned int a, b, c, d, e;
-typedef union {
-       unsigned char c[64];
-       unsigned int l[16];
-} CHAR64LONG16;
-CHAR64LONG16* block;
-#ifdef SHA1HANDSOFF
-static unsigned char workspace[64];
+       unsigned int a, b, c, d, e;
+
+       typedef union {
+               unsigned char c[64];
+               unsigned int l[16];
+       } CHAR64LONG16;
+       CHAR64LONG16* block;
+       unsigned char workspace[64];
        block = (CHAR64LONG16*)workspace;
        memcpy(block, buffer, 64);
-#else
-       block = (CHAR64LONG16*)buffer;
-#endif
+
        /* Copy context->state[] to working vars */
        a = state[0];
        b = state[1];
@@ -100,6 +98,7 @@ static unsigned char workspace[64];
        state[2] += c;
        state[3] += d;
        state[4] += e;
+
        /* Wipe variables */
        a = b = c = d = e = 0;
 }
@@ -107,69 +106,66 @@ static unsigned char workspace[64];
 
 /* SHA1Init - Initialize new context */
 
-void SHA1Init(SHA1_CTX* context)
+void sha1_init(struct sha1 *this)
 {
        /* SHA1 initialization constants */
-       context->state[0] = 0x67452301;
-       context->state[1] = 0xEFCDAB89;
-       context->state[2] = 0x98BADCFE;
-       context->state[3] = 0x10325476;
-       context->state[4] = 0xC3D2E1F0;
-       context->count[0] = context->count[1] = 0;
+       this->state[0] = 0x67452301;
+       this->state[1] = 0xEFCDAB89;
+       this->state[2] = 0x98BADCFE;
+       this->state[3] = 0x10325476;
+       this->state[4] = 0xC3D2E1F0;
+       this->count[0] = this->count[1] = 0;
 }
 
+/* Run your data through this function. */
 
-/* Run your data through this. */
-
-void SHA1Update(SHA1_CTX* context, unsigned char* data, unsigned int len)
+void sha1_update(struct sha1 *this, unsigned char *data, unsigned int len)
 {
-unsigned int i, j;
+       unsigned int i, j;
 
-       j = (context->count[0] >> 3) & 63;
-       if ((context->count[0] += len << 3) < (len << 3)) context->count[1]++;
-       context->count[1] += (len >> 29);
+       j = (this->count[0] >> 3) & 63;
+       if ((this->count[0] += len << 3) < (len << 3)) this->count[1]++;
+       this->count[1] += (len >> 29);
        if ((j + len) > 63) {
-               memcpy(&context->buffer[j], data, (i = 64-j));
-               SHA1Transform(context->state, context->buffer);
-               for ( ; i + 63 < len; i += 64) {
-                       SHA1Transform(context->state, &data[i]);
-               }
+               memcpy(this->buffer + j, data, (i = 64-j));
+               sha1_transform(this->state, this->buffer);
+               for ( ; i + 63 < len; i += 64)
+                       sha1_transform(this->state, data + i);
                j = 0;
        }
        else i = 0;
-       memcpy(&context->buffer[j], &data[i], len - i);
+       memcpy(this->buffer + j, data + i, len - i);
 }
 
 
 /* Add padding and return the message digest. */
 
-void SHA1Final(unsigned char digest[20], SHA1_CTX* context)
+void sha1_final(struct sha1 *this, unsigned char digest[20])
 {
-unsigned int i, j;
-unsigned char finalcount[8];
+       unsigned int i, j;
+       unsigned char finalcount[8];
 
        for (i = 0; i < 8; i++) {
-               finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
+               finalcount[i] = (unsigned char)((this->count[(i >= 4 ? 0 : 1)]
                 >> ((3-(i & 3)) * 8) ) & 255);  /* Endian independent */
        }
-       SHA1Update(context, (unsigned char *)"\200", 1);
-       while ((context->count[0] & 504) != 448) {
-               SHA1Update(context, (unsigned char *)"\0", 1);
+       sha1_update(this, (unsigned char *)"\200", 1);
+       while ((this->count[0] & 504) != 448) {
+               sha1_update(this, (unsigned char *)"\0", 1);
        }
-       SHA1Update(context, finalcount, 8);  /* Should cause a SHA1Transform() */
+       sha1_update(this, finalcount, 8);  /* Should cause a SHA1Transform() */
        for (i = 0; i < 20; i++) {
                digest[i] = (unsigned char)
-                ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
+                ((this->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
        }
        /* Wipe variables */
        i = j = 0;
-       memset(context->buffer, 0, 64);
-       memset(context->state, 0, 20);
-       memset(context->count, 0, 8);
-       memset(&finalcount, 0, 8);
-#ifdef SHA1HANDSOFF  /* make SHA1Transform overwrite it's own static vars */
-       SHA1Transform(context->state, context->buffer);
-#endif
+       memset(this->buffer, 0, 64);
+       memset(this->state, 0, 20);
+       memset(this->count, 0, 8);
+       memset(finalcount, 0, 8);
+       /* make SHA1Transform overwrite it's own static vars */
+       sha1_transform(this->state, this->buffer);
 }
 
 
@@ -178,10 +174,10 @@ unsigned char finalcount[8];
 
 int main(int argc, char** argv)
 {
-int i, j;
-SHA1_CTX context;
-unsigned char digest[20], buffer[16384];
-FILE* file;
+       int i, j;
+       struct sha1 this;
+       unsigned char digest[20], buffer[16384];
+       FILE* file;
 
        if (argc > 2) {
                puts("Public domain SHA-1 implementation - by Steve Reid <steve@edmweb.com>");
@@ -196,20 +192,14 @@ FILE* file;
                        fputs("Unable to open file.", stderr);
                        exit(-1);
                }
-       } 
-       SHA1Init(&context);
+       }
+       sha1_init(&this);
        while (!feof(file)) {  /* note: what if ferror(file) */
                i = fread(buffer, 1, 16384, file);
-               SHA1Update(&context, buffer, i);
+               sha1_update(&this, buffer, i);
        }
-       SHA1Final(digest, &context);
+       sha1_final(&this, digest);
        fclose(file);
-       for (i = 0; i < 5; i++) {
-               for (j = 0; j < 4; j++) {
-                       printf("%02X", digest[i*4+j]);
-               }
-               putchar(' ');
-       }
-       putchar('\n');
+       printy(digest);
        exit(0);
 }