diff options
Diffstat (limited to 'contrib/pgcrypto/crypt-gensalt.c')
| -rw-r--r-- | contrib/pgcrypto/crypt-gensalt.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/contrib/pgcrypto/crypt-gensalt.c b/contrib/pgcrypto/crypt-gensalt.c new file mode 100644 index 0000000..740f361 --- /dev/null +++ b/contrib/pgcrypto/crypt-gensalt.c @@ -0,0 +1,187 @@ +/* + * Written by Solar Designer and placed in the public domain. + * See crypt_blowfish.c for more information. + * + * contrib/pgcrypto/crypt-gensalt.c + * + * This file contains salt generation functions for the traditional and + * other common crypt(3) algorithms, except for bcrypt which is defined + * entirely in crypt_blowfish.c. + * + * Put bcrypt generator also here as crypt-blowfish.c + * may not be compiled always. -- marko + */ + +#include "postgres.h" + +#include "px-crypt.h" + +typedef unsigned int BF_word; + +static unsigned char _crypt_itoa64[64 + 1] = +"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; + +char * +_crypt_gensalt_traditional_rn(unsigned long count, + const char *input, int size, char *output, int output_size) +{ + if (size < 2 || output_size < 2 + 1 || (count && count != 25)) + { + if (output_size > 0) + output[0] = '\0'; + return NULL; + } + + output[0] = _crypt_itoa64[(unsigned int) input[0] & 0x3f]; + output[1] = _crypt_itoa64[(unsigned int) input[1] & 0x3f]; + output[2] = '\0'; + + return output; +} + +char * +_crypt_gensalt_extended_rn(unsigned long count, + const char *input, int size, char *output, int output_size) +{ + unsigned long value; + +/* Even iteration counts make it easier to detect weak DES keys from a look + * at the hash, so they should be avoided */ + if (size < 3 || output_size < 1 + 4 + 4 + 1 || + (count && (count > 0xffffff || !(count & 1)))) + { + if (output_size > 0) + output[0] = '\0'; + return NULL; + } + + if (!count) + count = 725; + + output[0] = '_'; + output[1] = _crypt_itoa64[count & 0x3f]; + output[2] = _crypt_itoa64[(count >> 6) & 0x3f]; + output[3] = _crypt_itoa64[(count >> 12) & 0x3f]; + output[4] = _crypt_itoa64[(count >> 18) & 0x3f]; + value = (unsigned long) (unsigned char) input[0] | + ((unsigned long) (unsigned char) input[1] << 8) | + ((unsigned long) (unsigned char) input[2] << 16); + output[5] = _crypt_itoa64[value & 0x3f]; + output[6] = _crypt_itoa64[(value >> 6) & 0x3f]; + output[7] = _crypt_itoa64[(value >> 12) & 0x3f]; + output[8] = _crypt_itoa64[(value >> 18) & 0x3f]; + output[9] = '\0'; + + return output; +} + +char * +_crypt_gensalt_md5_rn(unsigned long count, + const char *input, int size, char *output, int output_size) +{ + unsigned long value; + + if (size < 3 || output_size < 3 + 4 + 1 || (count && count != 1000)) + { + if (output_size > 0) + output[0] = '\0'; + return NULL; + } + + output[0] = '$'; + output[1] = '1'; + output[2] = '$'; + value = (unsigned long) (unsigned char) input[0] | + ((unsigned long) (unsigned char) input[1] << 8) | + ((unsigned long) (unsigned char) input[2] << 16); + output[3] = _crypt_itoa64[value & 0x3f]; + output[4] = _crypt_itoa64[(value >> 6) & 0x3f]; + output[5] = _crypt_itoa64[(value >> 12) & 0x3f]; + output[6] = _crypt_itoa64[(value >> 18) & 0x3f]; + output[7] = '\0'; + + if (size >= 6 && output_size >= 3 + 4 + 4 + 1) + { + value = (unsigned long) (unsigned char) input[3] | + ((unsigned long) (unsigned char) input[4] << 8) | + ((unsigned long) (unsigned char) input[5] << 16); + output[7] = _crypt_itoa64[value & 0x3f]; + output[8] = _crypt_itoa64[(value >> 6) & 0x3f]; + output[9] = _crypt_itoa64[(value >> 12) & 0x3f]; + output[10] = _crypt_itoa64[(value >> 18) & 0x3f]; + output[11] = '\0'; + } + + return output; +} + + + +static unsigned char BF_itoa64[64 + 1] = +"./ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"; + +static void +BF_encode(char *dst, const BF_word *src, int size) +{ + const unsigned char *sptr = (const unsigned char *) src; + const unsigned char *end = sptr + size; + unsigned char *dptr = (unsigned char *) dst; + unsigned int c1, + c2; + + do + { + c1 = *sptr++; + *dptr++ = BF_itoa64[c1 >> 2]; + c1 = (c1 & 0x03) << 4; + if (sptr >= end) + { + *dptr++ = BF_itoa64[c1]; + break; + } + + c2 = *sptr++; + c1 |= c2 >> 4; + *dptr++ = BF_itoa64[c1]; + c1 = (c2 & 0x0f) << 2; + if (sptr >= end) + { + *dptr++ = BF_itoa64[c1]; + break; + } + + c2 = *sptr++; + c1 |= c2 >> 6; + *dptr++ = BF_itoa64[c1]; + *dptr++ = BF_itoa64[c2 & 0x3f]; + } while (sptr < end); +} + +char * +_crypt_gensalt_blowfish_rn(unsigned long count, + const char *input, int size, char *output, int output_size) +{ + if (size < 16 || output_size < 7 + 22 + 1 || + (count && (count < 4 || count > 31))) + { + if (output_size > 0) + output[0] = '\0'; + return NULL; + } + + if (!count) + count = 5; + + output[0] = '$'; + output[1] = '2'; + output[2] = 'a'; + output[3] = '$'; + output[4] = '0' + count / 10; + output[5] = '0' + count % 10; + output[6] = '$'; + + BF_encode(&output[7], (const BF_word *) input, 16); + output[7 + 22] = '\0'; + + return output; +} |