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-rw-r--r--tools/plink/sshmd5.c684
1 files changed, 340 insertions, 344 deletions
diff --git a/tools/plink/sshmd5.c b/tools/plink/sshmd5.c
index 80474dfad..2fdb59007 100644
--- a/tools/plink/sshmd5.c
+++ b/tools/plink/sshmd5.c
@@ -1,344 +1,340 @@
-#include "ssh.h"
-
-/*
- * MD5 implementation for PuTTY. Written directly from the spec by
- * Simon Tatham.
- */
-
-/* ----------------------------------------------------------------------
- * Core MD5 algorithm: processes 16-word blocks into a message digest.
- */
-
-#define F(x,y,z) ( ((x) & (y)) | ((~(x)) & (z)) )
-#define G(x,y,z) ( ((x) & (z)) | ((~(z)) & (y)) )
-#define H(x,y,z) ( (x) ^ (y) ^ (z) )
-#define I(x,y,z) ( (y) ^ ( (x) | ~(z) ) )
-
-#define rol(x,y) ( ((x) << (y)) | (((uint32)x) >> (32-y)) )
-
-#define subround(f,w,x,y,z,k,s,ti) \
- w = x + rol(w + f(x,y,z) + block[k] + ti, s)
-
-static void MD5_Core_Init(MD5_Core_State * s)
-{
- s->h[0] = 0x67452301;
- s->h[1] = 0xefcdab89;
- s->h[2] = 0x98badcfe;
- s->h[3] = 0x10325476;
-}
-
-static void MD5_Block(MD5_Core_State * s, uint32 * block)
-{
- uint32 a, b, c, d;
-
- a = s->h[0];
- b = s->h[1];
- c = s->h[2];
- d = s->h[3];
-
- subround(F, a, b, c, d, 0, 7, 0xd76aa478);
- subround(F, d, a, b, c, 1, 12, 0xe8c7b756);
- subround(F, c, d, a, b, 2, 17, 0x242070db);
- subround(F, b, c, d, a, 3, 22, 0xc1bdceee);
- subround(F, a, b, c, d, 4, 7, 0xf57c0faf);
- subround(F, d, a, b, c, 5, 12, 0x4787c62a);
- subround(F, c, d, a, b, 6, 17, 0xa8304613);
- subround(F, b, c, d, a, 7, 22, 0xfd469501);
- subround(F, a, b, c, d, 8, 7, 0x698098d8);
- subround(F, d, a, b, c, 9, 12, 0x8b44f7af);
- subround(F, c, d, a, b, 10, 17, 0xffff5bb1);
- subround(F, b, c, d, a, 11, 22, 0x895cd7be);
- subround(F, a, b, c, d, 12, 7, 0x6b901122);
- subround(F, d, a, b, c, 13, 12, 0xfd987193);
- subround(F, c, d, a, b, 14, 17, 0xa679438e);
- subround(F, b, c, d, a, 15, 22, 0x49b40821);
- subround(G, a, b, c, d, 1, 5, 0xf61e2562);
- subround(G, d, a, b, c, 6, 9, 0xc040b340);
- subround(G, c, d, a, b, 11, 14, 0x265e5a51);
- subround(G, b, c, d, a, 0, 20, 0xe9b6c7aa);
- subround(G, a, b, c, d, 5, 5, 0xd62f105d);
- subround(G, d, a, b, c, 10, 9, 0x02441453);
- subround(G, c, d, a, b, 15, 14, 0xd8a1e681);
- subround(G, b, c, d, a, 4, 20, 0xe7d3fbc8);
- subround(G, a, b, c, d, 9, 5, 0x21e1cde6);
- subround(G, d, a, b, c, 14, 9, 0xc33707d6);
- subround(G, c, d, a, b, 3, 14, 0xf4d50d87);
- subround(G, b, c, d, a, 8, 20, 0x455a14ed);
- subround(G, a, b, c, d, 13, 5, 0xa9e3e905);
- subround(G, d, a, b, c, 2, 9, 0xfcefa3f8);
- subround(G, c, d, a, b, 7, 14, 0x676f02d9);
- subround(G, b, c, d, a, 12, 20, 0x8d2a4c8a);
- subround(H, a, b, c, d, 5, 4, 0xfffa3942);
- subround(H, d, a, b, c, 8, 11, 0x8771f681);
- subround(H, c, d, a, b, 11, 16, 0x6d9d6122);
- subround(H, b, c, d, a, 14, 23, 0xfde5380c);
- subround(H, a, b, c, d, 1, 4, 0xa4beea44);
- subround(H, d, a, b, c, 4, 11, 0x4bdecfa9);
- subround(H, c, d, a, b, 7, 16, 0xf6bb4b60);
- subround(H, b, c, d, a, 10, 23, 0xbebfbc70);
- subround(H, a, b, c, d, 13, 4, 0x289b7ec6);
- subround(H, d, a, b, c, 0, 11, 0xeaa127fa);
- subround(H, c, d, a, b, 3, 16, 0xd4ef3085);
- subround(H, b, c, d, a, 6, 23, 0x04881d05);
- subround(H, a, b, c, d, 9, 4, 0xd9d4d039);
- subround(H, d, a, b, c, 12, 11, 0xe6db99e5);
- subround(H, c, d, a, b, 15, 16, 0x1fa27cf8);
- subround(H, b, c, d, a, 2, 23, 0xc4ac5665);
- subround(I, a, b, c, d, 0, 6, 0xf4292244);
- subround(I, d, a, b, c, 7, 10, 0x432aff97);
- subround(I, c, d, a, b, 14, 15, 0xab9423a7);
- subround(I, b, c, d, a, 5, 21, 0xfc93a039);
- subround(I, a, b, c, d, 12, 6, 0x655b59c3);
- subround(I, d, a, b, c, 3, 10, 0x8f0ccc92);
- subround(I, c, d, a, b, 10, 15, 0xffeff47d);
- subround(I, b, c, d, a, 1, 21, 0x85845dd1);
- subround(I, a, b, c, d, 8, 6, 0x6fa87e4f);
- subround(I, d, a, b, c, 15, 10, 0xfe2ce6e0);
- subround(I, c, d, a, b, 6, 15, 0xa3014314);
- subround(I, b, c, d, a, 13, 21, 0x4e0811a1);
- subround(I, a, b, c, d, 4, 6, 0xf7537e82);
- subround(I, d, a, b, c, 11, 10, 0xbd3af235);
- subround(I, c, d, a, b, 2, 15, 0x2ad7d2bb);
- subround(I, b, c, d, a, 9, 21, 0xeb86d391);
-
- s->h[0] += a;
- s->h[1] += b;
- s->h[2] += c;
- s->h[3] += d;
-}
-
-/* ----------------------------------------------------------------------
- * Outer MD5 algorithm: take an arbitrary length byte string,
- * convert it into 16-word blocks with the prescribed padding at
- * the end, and pass those blocks to the core MD5 algorithm.
- */
-
-#define BLKSIZE 64
-
-void MD5Init(struct MD5Context *s)
-{
- MD5_Core_Init(&s->core);
- s->blkused = 0;
- s->lenhi = s->lenlo = 0;
-}
-
-void MD5Update(struct MD5Context *s, unsigned char const *p, unsigned len)
-{
- unsigned char *q = (unsigned char *) p;
- uint32 wordblock[16];
- uint32 lenw = len;
- int i;
-
- /*
- * Update the length field.
- */
- s->lenlo += lenw;
- s->lenhi += (s->lenlo < lenw);
-
- if (s->blkused + len < BLKSIZE) {
- /*
- * Trivial case: just add to the block.
- */
- memcpy(s->block + s->blkused, q, len);
- s->blkused += len;
- } else {
- /*
- * We must complete and process at least one block.
- */
- while (s->blkused + len >= BLKSIZE) {
- memcpy(s->block + s->blkused, q, BLKSIZE - s->blkused);
- q += BLKSIZE - s->blkused;
- len -= BLKSIZE - s->blkused;
- /* Now process the block. Gather bytes little-endian into words */
- for (i = 0; i < 16; i++) {
- wordblock[i] =
- (((uint32) s->block[i * 4 + 3]) << 24) |
- (((uint32) s->block[i * 4 + 2]) << 16) |
- (((uint32) s->block[i * 4 + 1]) << 8) |
- (((uint32) s->block[i * 4 + 0]) << 0);
- }
- MD5_Block(&s->core, wordblock);
- s->blkused = 0;
- }
- memcpy(s->block, q, len);
- s->blkused = len;
- }
-}
-
-void MD5Final(unsigned char output[16], struct MD5Context *s)
-{
- int i;
- unsigned pad;
- unsigned char c[64];
- uint32 lenhi, lenlo;
-
- if (s->blkused >= 56)
- pad = 56 + 64 - s->blkused;
- else
- pad = 56 - s->blkused;
-
- lenhi = (s->lenhi << 3) | (s->lenlo >> (32 - 3));
- lenlo = (s->lenlo << 3);
-
- memset(c, 0, pad);
- c[0] = 0x80;
- MD5Update(s, c, pad);
-
- c[7] = (lenhi >> 24) & 0xFF;
- c[6] = (lenhi >> 16) & 0xFF;
- c[5] = (lenhi >> 8) & 0xFF;
- c[4] = (lenhi >> 0) & 0xFF;
- c[3] = (lenlo >> 24) & 0xFF;
- c[2] = (lenlo >> 16) & 0xFF;
- c[1] = (lenlo >> 8) & 0xFF;
- c[0] = (lenlo >> 0) & 0xFF;
-
- MD5Update(s, c, 8);
-
- for (i = 0; i < 4; i++) {
- output[4 * i + 3] = (s->core.h[i] >> 24) & 0xFF;
- output[4 * i + 2] = (s->core.h[i] >> 16) & 0xFF;
- output[4 * i + 1] = (s->core.h[i] >> 8) & 0xFF;
- output[4 * i + 0] = (s->core.h[i] >> 0) & 0xFF;
- }
-}
-
-void MD5Simple(void const *p, unsigned len, unsigned char output[16])
-{
- struct MD5Context s;
-
- MD5Init(&s);
- MD5Update(&s, (unsigned char const *)p, len);
- MD5Final(output, &s);
-}
-
-/* ----------------------------------------------------------------------
- * The above is the MD5 algorithm itself. Now we implement the
- * HMAC wrapper on it.
- *
- * Some of these functions are exported directly, because they are
- * useful elsewhere (SOCKS5 CHAP authentication uses HMAC-MD5).
- */
-
-void *hmacmd5_make_context(void)
-{
- return snewn(3, struct MD5Context);
-}
-
-void hmacmd5_free_context(void *handle)
-{
- sfree(handle);
-}
-
-void hmacmd5_key(void *handle, void const *keyv, int len)
-{
- struct MD5Context *keys = (struct MD5Context *)handle;
- unsigned char foo[64];
- unsigned char const *key = (unsigned char const *)keyv;
- int i;
-
- memset(foo, 0x36, 64);
- for (i = 0; i < len && i < 64; i++)
- foo[i] ^= key[i];
- MD5Init(&keys[0]);
- MD5Update(&keys[0], foo, 64);
-
- memset(foo, 0x5C, 64);
- for (i = 0; i < len && i < 64; i++)
- foo[i] ^= key[i];
- MD5Init(&keys[1]);
- MD5Update(&keys[1], foo, 64);
-
- memset(foo, 0, 64); /* burn the evidence */
-}
-
-static void hmacmd5_key_16(void *handle, unsigned char *key)
-{
- hmacmd5_key(handle, key, 16);
-}
-
-static void hmacmd5_start(void *handle)
-{
- struct MD5Context *keys = (struct MD5Context *)handle;
-
- keys[2] = keys[0]; /* structure copy */
-}
-
-static void hmacmd5_bytes(void *handle, unsigned char const *blk, int len)
-{
- struct MD5Context *keys = (struct MD5Context *)handle;
- MD5Update(&keys[2], blk, len);
-}
-
-static void hmacmd5_genresult(void *handle, unsigned char *hmac)
-{
- struct MD5Context *keys = (struct MD5Context *)handle;
- struct MD5Context s;
- unsigned char intermediate[16];
-
- s = keys[2]; /* structure copy */
- MD5Final(intermediate, &s);
- s = keys[1]; /* structure copy */
- MD5Update(&s, intermediate, 16);
- MD5Final(hmac, &s);
-}
-
-static int hmacmd5_verresult(void *handle, unsigned char const *hmac)
-{
- unsigned char correct[16];
- hmacmd5_genresult(handle, correct);
- return !memcmp(correct, hmac, 16);
-}
-
-static void hmacmd5_do_hmac_internal(void *handle,
- unsigned char const *blk, int len,
- unsigned char const *blk2, int len2,
- unsigned char *hmac)
-{
- hmacmd5_start(handle);
- hmacmd5_bytes(handle, blk, len);
- if (blk2) hmacmd5_bytes(handle, blk2, len2);
- hmacmd5_genresult(handle, hmac);
-}
-
-void hmacmd5_do_hmac(void *handle, unsigned char const *blk, int len,
- unsigned char *hmac)
-{
- hmacmd5_do_hmac_internal(handle, blk, len, NULL, 0, hmac);
-}
-
-static void hmacmd5_do_hmac_ssh(void *handle, unsigned char const *blk, int len,
- unsigned long seq, unsigned char *hmac)
-{
- unsigned char seqbuf[16];
-
- seqbuf[0] = (unsigned char) ((seq >> 24) & 0xFF);
- seqbuf[1] = (unsigned char) ((seq >> 16) & 0xFF);
- seqbuf[2] = (unsigned char) ((seq >> 8) & 0xFF);
- seqbuf[3] = (unsigned char) ((seq) & 0xFF);
-
- hmacmd5_do_hmac_internal(handle, seqbuf, 4, blk, len, hmac);
-}
-
-static void hmacmd5_generate(void *handle, unsigned char *blk, int len,
- unsigned long seq)
-{
- hmacmd5_do_hmac_ssh(handle, blk, len, seq, blk + len);
-}
-
-static int hmacmd5_verify(void *handle, unsigned char *blk, int len,
- unsigned long seq)
-{
- unsigned char correct[16];
- hmacmd5_do_hmac_ssh(handle, blk, len, seq, correct);
- return !memcmp(correct, blk + len, 16);
-}
-
-const struct ssh_mac ssh_hmac_md5 = {
- hmacmd5_make_context, hmacmd5_free_context, hmacmd5_key_16,
- hmacmd5_generate, hmacmd5_verify,
- hmacmd5_start, hmacmd5_bytes, hmacmd5_genresult, hmacmd5_verresult,
- "hmac-md5",
- 16,
- "HMAC-MD5"
-};
+#include "ssh.h"
+
+/*
+ * MD5 implementation for PuTTY. Written directly from the spec by
+ * Simon Tatham.
+ */
+
+/* ----------------------------------------------------------------------
+ * Core MD5 algorithm: processes 16-word blocks into a message digest.
+ */
+
+#define F(x,y,z) ( ((x) & (y)) | ((~(x)) & (z)) )
+#define G(x,y,z) ( ((x) & (z)) | ((~(z)) & (y)) )
+#define H(x,y,z) ( (x) ^ (y) ^ (z) )
+#define I(x,y,z) ( (y) ^ ( (x) | ~(z) ) )
+
+#define rol(x,y) ( ((x) << (y)) | (((uint32)x) >> (32-y)) )
+
+#define subround(f,w,x,y,z,k,s,ti) \
+ w = x + rol(w + f(x,y,z) + block[k] + ti, s)
+
+static void MD5_Core_Init(MD5_Core_State * s)
+{
+ s->h[0] = 0x67452301;
+ s->h[1] = 0xefcdab89;
+ s->h[2] = 0x98badcfe;
+ s->h[3] = 0x10325476;
+}
+
+static void MD5_Block(MD5_Core_State * s, uint32 * block)
+{
+ uint32 a, b, c, d;
+
+ a = s->h[0];
+ b = s->h[1];
+ c = s->h[2];
+ d = s->h[3];
+
+ subround(F, a, b, c, d, 0, 7, 0xd76aa478);
+ subround(F, d, a, b, c, 1, 12, 0xe8c7b756);
+ subround(F, c, d, a, b, 2, 17, 0x242070db);
+ subround(F, b, c, d, a, 3, 22, 0xc1bdceee);
+ subround(F, a, b, c, d, 4, 7, 0xf57c0faf);
+ subround(F, d, a, b, c, 5, 12, 0x4787c62a);
+ subround(F, c, d, a, b, 6, 17, 0xa8304613);
+ subround(F, b, c, d, a, 7, 22, 0xfd469501);
+ subround(F, a, b, c, d, 8, 7, 0x698098d8);
+ subround(F, d, a, b, c, 9, 12, 0x8b44f7af);
+ subround(F, c, d, a, b, 10, 17, 0xffff5bb1);
+ subround(F, b, c, d, a, 11, 22, 0x895cd7be);
+ subround(F, a, b, c, d, 12, 7, 0x6b901122);
+ subround(F, d, a, b, c, 13, 12, 0xfd987193);
+ subround(F, c, d, a, b, 14, 17, 0xa679438e);
+ subround(F, b, c, d, a, 15, 22, 0x49b40821);
+ subround(G, a, b, c, d, 1, 5, 0xf61e2562);
+ subround(G, d, a, b, c, 6, 9, 0xc040b340);
+ subround(G, c, d, a, b, 11, 14, 0x265e5a51);
+ subround(G, b, c, d, a, 0, 20, 0xe9b6c7aa);
+ subround(G, a, b, c, d, 5, 5, 0xd62f105d);
+ subround(G, d, a, b, c, 10, 9, 0x02441453);
+ subround(G, c, d, a, b, 15, 14, 0xd8a1e681);
+ subround(G, b, c, d, a, 4, 20, 0xe7d3fbc8);
+ subround(G, a, b, c, d, 9, 5, 0x21e1cde6);
+ subround(G, d, a, b, c, 14, 9, 0xc33707d6);
+ subround(G, c, d, a, b, 3, 14, 0xf4d50d87);
+ subround(G, b, c, d, a, 8, 20, 0x455a14ed);
+ subround(G, a, b, c, d, 13, 5, 0xa9e3e905);
+ subround(G, d, a, b, c, 2, 9, 0xfcefa3f8);
+ subround(G, c, d, a, b, 7, 14, 0x676f02d9);
+ subround(G, b, c, d, a, 12, 20, 0x8d2a4c8a);
+ subround(H, a, b, c, d, 5, 4, 0xfffa3942);
+ subround(H, d, a, b, c, 8, 11, 0x8771f681);
+ subround(H, c, d, a, b, 11, 16, 0x6d9d6122);
+ subround(H, b, c, d, a, 14, 23, 0xfde5380c);
+ subround(H, a, b, c, d, 1, 4, 0xa4beea44);
+ subround(H, d, a, b, c, 4, 11, 0x4bdecfa9);
+ subround(H, c, d, a, b, 7, 16, 0xf6bb4b60);
+ subround(H, b, c, d, a, 10, 23, 0xbebfbc70);
+ subround(H, a, b, c, d, 13, 4, 0x289b7ec6);
+ subround(H, d, a, b, c, 0, 11, 0xeaa127fa);
+ subround(H, c, d, a, b, 3, 16, 0xd4ef3085);
+ subround(H, b, c, d, a, 6, 23, 0x04881d05);
+ subround(H, a, b, c, d, 9, 4, 0xd9d4d039);
+ subround(H, d, a, b, c, 12, 11, 0xe6db99e5);
+ subround(H, c, d, a, b, 15, 16, 0x1fa27cf8);
+ subround(H, b, c, d, a, 2, 23, 0xc4ac5665);
+ subround(I, a, b, c, d, 0, 6, 0xf4292244);
+ subround(I, d, a, b, c, 7, 10, 0x432aff97);
+ subround(I, c, d, a, b, 14, 15, 0xab9423a7);
+ subround(I, b, c, d, a, 5, 21, 0xfc93a039);
+ subround(I, a, b, c, d, 12, 6, 0x655b59c3);
+ subround(I, d, a, b, c, 3, 10, 0x8f0ccc92);
+ subround(I, c, d, a, b, 10, 15, 0xffeff47d);
+ subround(I, b, c, d, a, 1, 21, 0x85845dd1);
+ subround(I, a, b, c, d, 8, 6, 0x6fa87e4f);
+ subround(I, d, a, b, c, 15, 10, 0xfe2ce6e0);
+ subround(I, c, d, a, b, 6, 15, 0xa3014314);
+ subround(I, b, c, d, a, 13, 21, 0x4e0811a1);
+ subround(I, a, b, c, d, 4, 6, 0xf7537e82);
+ subround(I, d, a, b, c, 11, 10, 0xbd3af235);
+ subround(I, c, d, a, b, 2, 15, 0x2ad7d2bb);
+ subround(I, b, c, d, a, 9, 21, 0xeb86d391);
+
+ s->h[0] += a;
+ s->h[1] += b;
+ s->h[2] += c;
+ s->h[3] += d;
+}
+
+/* ----------------------------------------------------------------------
+ * Outer MD5 algorithm: take an arbitrary length byte string,
+ * convert it into 16-word blocks with the prescribed padding at
+ * the end, and pass those blocks to the core MD5 algorithm.
+ */
+
+#define BLKSIZE 64
+
+void MD5Init(struct MD5Context *s)
+{
+ MD5_Core_Init(&s->core);
+ s->blkused = 0;
+ s->lenhi = s->lenlo = 0;
+}
+
+void MD5Update(struct MD5Context *s, unsigned char const *p, unsigned len)
+{
+ unsigned char *q = (unsigned char *) p;
+ uint32 wordblock[16];
+ uint32 lenw = len;
+ int i;
+
+ /*
+ * Update the length field.
+ */
+ s->lenlo += lenw;
+ s->lenhi += (s->lenlo < lenw);
+
+ if (s->blkused + len < BLKSIZE) {
+ /*
+ * Trivial case: just add to the block.
+ */
+ memcpy(s->block + s->blkused, q, len);
+ s->blkused += len;
+ } else {
+ /*
+ * We must complete and process at least one block.
+ */
+ while (s->blkused + len >= BLKSIZE) {
+ memcpy(s->block + s->blkused, q, BLKSIZE - s->blkused);
+ q += BLKSIZE - s->blkused;
+ len -= BLKSIZE - s->blkused;
+ /* Now process the block. Gather bytes little-endian into words */
+ for (i = 0; i < 16; i++) {
+ wordblock[i] =
+ (((uint32) s->block[i * 4 + 3]) << 24) |
+ (((uint32) s->block[i * 4 + 2]) << 16) |
+ (((uint32) s->block[i * 4 + 1]) << 8) |
+ (((uint32) s->block[i * 4 + 0]) << 0);
+ }
+ MD5_Block(&s->core, wordblock);
+ s->blkused = 0;
+ }
+ memcpy(s->block, q, len);
+ s->blkused = len;
+ }
+}
+
+void MD5Final(unsigned char output[16], struct MD5Context *s)
+{
+ int i;
+ unsigned pad;
+ unsigned char c[64];
+ uint32 lenhi, lenlo;
+
+ if (s->blkused >= 56)
+ pad = 56 + 64 - s->blkused;
+ else
+ pad = 56 - s->blkused;
+
+ lenhi = (s->lenhi << 3) | (s->lenlo >> (32 - 3));
+ lenlo = (s->lenlo << 3);
+
+ memset(c, 0, pad);
+ c[0] = 0x80;
+ MD5Update(s, c, pad);
+
+ c[7] = (lenhi >> 24) & 0xFF;
+ c[6] = (lenhi >> 16) & 0xFF;
+ c[5] = (lenhi >> 8) & 0xFF;
+ c[4] = (lenhi >> 0) & 0xFF;
+ c[3] = (lenlo >> 24) & 0xFF;
+ c[2] = (lenlo >> 16) & 0xFF;
+ c[1] = (lenlo >> 8) & 0xFF;
+ c[0] = (lenlo >> 0) & 0xFF;
+
+ MD5Update(s, c, 8);
+
+ for (i = 0; i < 4; i++) {
+ output[4 * i + 3] = (s->core.h[i] >> 24) & 0xFF;
+ output[4 * i + 2] = (s->core.h[i] >> 16) & 0xFF;
+ output[4 * i + 1] = (s->core.h[i] >> 8) & 0xFF;
+ output[4 * i + 0] = (s->core.h[i] >> 0) & 0xFF;
+ }
+}
+
+void MD5Simple(void const *p, unsigned len, unsigned char output[16])
+{
+ struct MD5Context s;
+
+ MD5Init(&s);
+ MD5Update(&s, (unsigned char const *)p, len);
+ MD5Final(output, &s);
+}
+
+/* ----------------------------------------------------------------------
+ * The above is the MD5 algorithm itself. Now we implement the
+ * HMAC wrapper on it.
+ *
+ * Some of these functions are exported directly, because they are
+ * useful elsewhere (SOCKS5 CHAP authentication uses HMAC-MD5).
+ */
+
+void *hmacmd5_make_context(void)
+{
+ return snewn(3, struct MD5Context);
+}
+
+void hmacmd5_free_context(void *handle)
+{
+ sfree(handle);
+}
+
+void hmacmd5_key(void *handle, void const *keyv, int len)
+{
+ struct MD5Context *keys = (struct MD5Context *)handle;
+ unsigned char foo[64];
+ unsigned char const *key = (unsigned char const *)keyv;
+ int i;
+
+ memset(foo, 0x36, 64);
+ for (i = 0; i < len && i < 64; i++)
+ foo[i] ^= key[i];
+ MD5Init(&keys[0]);
+ MD5Update(&keys[0], foo, 64);
+
+ memset(foo, 0x5C, 64);
+ for (i = 0; i < len && i < 64; i++)
+ foo[i] ^= key[i];
+ MD5Init(&keys[1]);
+ MD5Update(&keys[1], foo, 64);
+
+ smemclr(foo, 64); /* burn the evidence */
+}
+
+static void hmacmd5_key_16(void *handle, unsigned char *key)
+{
+ hmacmd5_key(handle, key, 16);
+}
+
+static void hmacmd5_start(void *handle)
+{
+ struct MD5Context *keys = (struct MD5Context *)handle;
+
+ keys[2] = keys[0]; /* structure copy */
+}
+
+static void hmacmd5_bytes(void *handle, unsigned char const *blk, int len)
+{
+ struct MD5Context *keys = (struct MD5Context *)handle;
+ MD5Update(&keys[2], blk, len);
+}
+
+static void hmacmd5_genresult(void *handle, unsigned char *hmac)
+{
+ struct MD5Context *keys = (struct MD5Context *)handle;
+ struct MD5Context s;
+ unsigned char intermediate[16];
+
+ s = keys[2]; /* structure copy */
+ MD5Final(intermediate, &s);
+ s = keys[1]; /* structure copy */
+ MD5Update(&s, intermediate, 16);
+ MD5Final(hmac, &s);
+}
+
+static int hmacmd5_verresult(void *handle, unsigned char const *hmac)
+{
+ unsigned char correct[16];
+ hmacmd5_genresult(handle, correct);
+ return !memcmp(correct, hmac, 16);
+}
+
+static void hmacmd5_do_hmac_internal(void *handle,
+ unsigned char const *blk, int len,
+ unsigned char const *blk2, int len2,
+ unsigned char *hmac)
+{
+ hmacmd5_start(handle);
+ hmacmd5_bytes(handle, blk, len);
+ if (blk2) hmacmd5_bytes(handle, blk2, len2);
+ hmacmd5_genresult(handle, hmac);
+}
+
+void hmacmd5_do_hmac(void *handle, unsigned char const *blk, int len,
+ unsigned char *hmac)
+{
+ hmacmd5_do_hmac_internal(handle, blk, len, NULL, 0, hmac);
+}
+
+static void hmacmd5_do_hmac_ssh(void *handle, unsigned char const *blk, int len,
+ unsigned long seq, unsigned char *hmac)
+{
+ unsigned char seqbuf[16];
+
+ PUT_32BIT_MSB_FIRST(seqbuf, seq);
+ hmacmd5_do_hmac_internal(handle, seqbuf, 4, blk, len, hmac);
+}
+
+static void hmacmd5_generate(void *handle, unsigned char *blk, int len,
+ unsigned long seq)
+{
+ hmacmd5_do_hmac_ssh(handle, blk, len, seq, blk + len);
+}
+
+static int hmacmd5_verify(void *handle, unsigned char *blk, int len,
+ unsigned long seq)
+{
+ unsigned char correct[16];
+ hmacmd5_do_hmac_ssh(handle, blk, len, seq, correct);
+ return !memcmp(correct, blk + len, 16);
+}
+
+const struct ssh_mac ssh_hmac_md5 = {
+ hmacmd5_make_context, hmacmd5_free_context, hmacmd5_key_16,
+ hmacmd5_generate, hmacmd5_verify,
+ hmacmd5_start, hmacmd5_bytes, hmacmd5_genresult, hmacmd5_verresult,
+ "hmac-md5",
+ 16,
+ "HMAC-MD5"
+};
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-24 21:57:34 +0000