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|
/*
* Hashing function for CUPS.
*
* Copyright © 2015-2019 by Apple Inc.
*
* Licensed under Apache License v2.0. See the file "LICENSE" for more
* information.
*/
/*
* Include necessary headers...
*/
#include "cups-private.h"
#ifdef __APPLE__
# include <CommonCrypto/CommonDigest.h>
#elif defined(HAVE_GNUTLS)
# include <gnutls/crypto.h>
# include "md5-internal.h"
#else
# include "md5-internal.h"
#endif /* __APPLE__ */
/*
* 'cupsHashData()' - Perform a hash function on the given data.
*
* The "algorithm" argument can be any of the registered, non-deprecated IPP
* hash algorithms for the "job-password-encryption" attribute, including
* "sha" for SHA-1, "sha-256" for SHA2-256, etc.
*
* The "hash" argument points to a buffer of "hashsize" bytes and should be at
* least 64 bytes in length for all of the supported algorithms.
*
* The returned hash is binary data.
*
* @since CUPS 2.2/macOS 10.12@
*/
ssize_t /* O - Size of hash or -1 on error */
cupsHashData(const char *algorithm, /* I - Algorithm name */
const void *data, /* I - Data to hash */
size_t datalen, /* I - Length of data to hash */
unsigned char *hash, /* I - Hash buffer */
size_t hashsize) /* I - Size of hash buffer */
{
if (!algorithm || !data || datalen == 0 || !hash || hashsize == 0)
{
_cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Bad arguments to function"), 1);
return (-1);
}
#ifdef __APPLE__
if (!strcmp(algorithm, "md5"))
{
/*
* MD5 (deprecated but widely used...)
*/
CC_MD5_CTX ctx; /* MD5 context */
if (hashsize < CC_MD5_DIGEST_LENGTH)
goto too_small;
CC_MD5_Init(&ctx);
CC_MD5_Update(&ctx, data, (CC_LONG)datalen);
CC_MD5_Final(hash, &ctx);
return (CC_MD5_DIGEST_LENGTH);
}
else if (!strcmp(algorithm, "sha"))
{
/*
* SHA-1...
*/
CC_SHA1_CTX ctx; /* SHA-1 context */
if (hashsize < CC_SHA1_DIGEST_LENGTH)
goto too_small;
CC_SHA1_Init(&ctx);
CC_SHA1_Update(&ctx, data, (CC_LONG)datalen);
CC_SHA1_Final(hash, &ctx);
return (CC_SHA1_DIGEST_LENGTH);
}
else if (!strcmp(algorithm, "sha2-224"))
{
CC_SHA256_CTX ctx; /* SHA-224 context */
if (hashsize < CC_SHA224_DIGEST_LENGTH)
goto too_small;
CC_SHA224_Init(&ctx);
CC_SHA224_Update(&ctx, data, (CC_LONG)datalen);
CC_SHA224_Final(hash, &ctx);
return (CC_SHA224_DIGEST_LENGTH);
}
else if (!strcmp(algorithm, "sha2-256"))
{
CC_SHA256_CTX ctx; /* SHA-256 context */
if (hashsize < CC_SHA256_DIGEST_LENGTH)
goto too_small;
CC_SHA256_Init(&ctx);
CC_SHA256_Update(&ctx, data, (CC_LONG)datalen);
CC_SHA256_Final(hash, &ctx);
return (CC_SHA256_DIGEST_LENGTH);
}
else if (!strcmp(algorithm, "sha2-384"))
{
CC_SHA512_CTX ctx; /* SHA-384 context */
if (hashsize < CC_SHA384_DIGEST_LENGTH)
goto too_small;
CC_SHA384_Init(&ctx);
CC_SHA384_Update(&ctx, data, (CC_LONG)datalen);
CC_SHA384_Final(hash, &ctx);
return (CC_SHA384_DIGEST_LENGTH);
}
else if (!strcmp(algorithm, "sha2-512"))
{
CC_SHA512_CTX ctx; /* SHA-512 context */
if (hashsize < CC_SHA512_DIGEST_LENGTH)
goto too_small;
CC_SHA512_Init(&ctx);
CC_SHA512_Update(&ctx, data, (CC_LONG)datalen);
CC_SHA512_Final(hash, &ctx);
return (CC_SHA512_DIGEST_LENGTH);
}
else if (!strcmp(algorithm, "sha2-512_224"))
{
CC_SHA512_CTX ctx; /* SHA-512 context */
unsigned char temp[CC_SHA512_DIGEST_LENGTH];
/* SHA-512 hash */
/*
* SHA2-512 truncated to 224 bits (28 bytes)...
*/
if (hashsize < CC_SHA224_DIGEST_LENGTH)
goto too_small;
CC_SHA512_Init(&ctx);
CC_SHA512_Update(&ctx, data, (CC_LONG)datalen);
CC_SHA512_Final(temp, &ctx);
memcpy(hash, temp, CC_SHA224_DIGEST_LENGTH);
return (CC_SHA224_DIGEST_LENGTH);
}
else if (!strcmp(algorithm, "sha2-512_256"))
{
CC_SHA512_CTX ctx; /* SHA-512 context */
unsigned char temp[CC_SHA512_DIGEST_LENGTH];
/* SHA-512 hash */
/*
* SHA2-512 truncated to 256 bits (32 bytes)...
*/
if (hashsize < CC_SHA256_DIGEST_LENGTH)
goto too_small;
CC_SHA512_Init(&ctx);
CC_SHA512_Update(&ctx, data, (CC_LONG)datalen);
CC_SHA512_Final(temp, &ctx);
memcpy(hash, temp, CC_SHA256_DIGEST_LENGTH);
return (CC_SHA256_DIGEST_LENGTH);
}
#elif defined(HAVE_GNUTLS)
gnutls_digest_algorithm_t alg = GNUTLS_DIG_UNKNOWN;
/* Algorithm */
unsigned char temp[64]; /* Temporary hash buffer */
size_t tempsize = 0; /* Truncate to this size? */
if (!strcmp(algorithm, "md5"))
{
/*
* Some versions of GNU TLS disable MD5 without warning...
*/
_cups_md5_state_t state; /* MD5 state info */
if (hashsize < 16)
goto too_small;
_cupsMD5Init(&state);
_cupsMD5Append(&state, data, (int)datalen);
_cupsMD5Finish(&state, hash);
return (16);
}
else if (!strcmp(algorithm, "sha"))
alg = GNUTLS_DIG_SHA1;
else if (!strcmp(algorithm, "sha2-224"))
alg = GNUTLS_DIG_SHA224;
else if (!strcmp(algorithm, "sha2-256"))
alg = GNUTLS_DIG_SHA256;
else if (!strcmp(algorithm, "sha2-384"))
alg = GNUTLS_DIG_SHA384;
else if (!strcmp(algorithm, "sha2-512"))
alg = GNUTLS_DIG_SHA512;
else if (!strcmp(algorithm, "sha2-512_224"))
{
alg = GNUTLS_DIG_SHA512;
tempsize = 28;
}
else if (!strcmp(algorithm, "sha2-512_256"))
{
alg = GNUTLS_DIG_SHA512;
tempsize = 32;
}
if (alg != GNUTLS_DIG_UNKNOWN)
{
if (tempsize > 0)
{
/*
* Truncate result to tempsize bytes...
*/
if (hashsize < tempsize)
goto too_small;
gnutls_hash_fast(alg, data, datalen, temp);
memcpy(hash, temp, tempsize);
return ((ssize_t)tempsize);
}
if (hashsize < gnutls_hash_get_len(alg))
goto too_small;
gnutls_hash_fast(alg, data, datalen, hash);
return ((ssize_t)gnutls_hash_get_len(alg));
}
#else
/*
* No hash support beyond MD5 without CommonCrypto or GNU TLS...
*/
if (!strcmp(algorithm, "md5"))
{
_cups_md5_state_t state; /* MD5 state info */
if (hashsize < 16)
goto too_small;
_cupsMD5Init(&state);
_cupsMD5Append(&state, data, datalen);
_cupsMD5Finish(&state, hash);
return (16);
}
else if (hashsize < 64)
goto too_small;
#endif /* __APPLE__ */
/*
* Unknown hash algorithm...
*/
_cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Unknown hash algorithm."), 1);
return (-1);
/*
* We get here if the buffer is too small.
*/
too_small:
_cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Hash buffer too small."), 1);
return (-1);
}
/*
* 'cupsHashString()' - Format a hash value as a hexadecimal string.
*
* The passed buffer must be at least 2 * hashsize + 1 characters in length.
*
* @since CUPS 2.2.7@
*/
const char * /* O - Formatted string */
cupsHashString(
const unsigned char *hash, /* I - Hash */
size_t hashsize, /* I - Size of hash */
char *buffer, /* I - String buffer */
size_t bufsize) /* I - Size of string buffer */
{
char *bufptr = buffer; /* Pointer into buffer */
static const char *hex = "0123456789abcdef";
/* Hex characters (lowercase!) */
/*
* Range check input...
*/
if (!hash || hashsize < 1 || !buffer || bufsize < (2 * hashsize + 1))
{
if (buffer)
*buffer = '\0';
return (NULL);
}
/*
* Loop until we've converted the whole hash...
*/
while (hashsize > 0)
{
*bufptr++ = hex[*hash >> 4];
*bufptr++ = hex[*hash & 15];
hash ++;
hashsize --;
}
*bufptr = '\0';
return (buffer);
}
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