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Support for encoding and decoding 256-bit digests in base64

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This commit is contained in:
Nick Mathewson 2009-08-19 20:03:40 -04:00
parent 5ef97ddd42
commit 8d41e6c471
3 changed files with 51 additions and 0 deletions
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38
src/common/crypto.c
View file

@ -2274,6 +2274,44 @@ digest_from_base64(char *digest, const char *d64)
#endif
}
/** Base-64 encode DIGEST256_LINE bytes from <b>digest</b>, remove the
* trailing = and newline characters, and store the nul-terminated result in
* the first BASE64_DIGEST256_LEN+1 bytes of <b>d64</b>. */
int
digest256_to_base64(char *d64, const char *digest)
{
char buf[256];
base64_encode(buf, sizeof(buf), digest, DIGEST256_LEN);
buf[BASE64_DIGEST256_LEN] = '\0';
memcpy(d64, buf, BASE64_DIGEST256_LEN+1);
return 0;
}
/** Given a base-64 encoded, nul-terminated digest in <b>d64</b> (without
* trailing newline or = characters), decode it and store the result in the
* first DIGEST256_LEN bytes at <b>digest</b>. */
int
digest256_from_base64(char *digest, const char *d64)
{
#ifdef USE_OPENSSL_BASE64
char buf_in[BASE64_DIGEST256_LEN+3];
char buf[256];
if (strlen(d64) != BASE64_DIGEST256_LEN)
return -1;
memcpy(buf_in, d64, BASE64_DIGEST256_LEN);
memcpy(buf_in+BASE64_DIGEST256_LEN, "=\n\0", 3);
if (base64_decode(buf, sizeof(buf), buf_in, strlen(buf_in)) != DIGEST256_LEN)
return -1;
memcpy(digest, buf, DIGEST256_LEN);
return 0;
#else
if (base64_decode(digest, DIGEST256_LEN, d64, strlen(d64)) == DIGEST256_LEN)
return 0;
else
return -1;
#endif
}
/** Implements base32 encoding as in rfc3548. Limitation: Requires
* that srclen*8 is a multiple of 5.
*/

2
src/common/crypto.h
View file

@ -211,6 +211,8 @@ int base32_decode(char *dest, size_t destlen, const char *src, size_t srclen);
int digest_to_base64(char *d64, const char *digest);
int digest_from_base64(char *digest, const char *d64);
int digest256_to_base64(char *d64, const char *digest);
int digest256_from_base64(char *digest, const char *d64);
/** Length of RFC2440-style S2K specifier: the first 8 bytes are a salt, the
* 9th describes how much iteration to do. */

11
src/test/test_crypto.c
View file

@ -472,6 +472,17 @@ test_crypto_formats(void)
test_assert(digest_from_base64(data3, "###") < 0);
/* Encoding SHA256 */
crypto_rand(data2, DIGEST256_LEN);
memset(data2, 100, 1024);
digest256_to_base64(data2, data1);
test_eq(BASE64_DIGEST256_LEN, strlen(data2));
test_eq(100, data2[BASE64_DIGEST256_LEN+2]);
memset(data3, 99, 1024);
test_eq(digest256_from_base64(data3, data2), 0);
test_memeq(data1, data3, DIGEST256_LEN);
test_eq(99, data3[DIGEST256_LEN+1]);
/* Base32 tests */
strlcpy(data1, "5chrs", 1024);
/* bit pattern is: [35 63 68 72 73] ->