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Diffstat (limited to 'secure/lib/libcrypt/crypt-blowfish.c')
| -rw-r--r-- | secure/lib/libcrypt/crypt-blowfish.c | 328 |
1 files changed, 328 insertions, 0 deletions
diff --git a/secure/lib/libcrypt/crypt-blowfish.c b/secure/lib/libcrypt/crypt-blowfish.c new file mode 100644 index 0000000..acd9057 --- /dev/null +++ b/secure/lib/libcrypt/crypt-blowfish.c @@ -0,0 +1,328 @@ +/* $OpenBSD: bcrypt.c,v 1.29 2014/02/24 19:45:43 tedu Exp $ */ + +/* + * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by Niels Provos. + * 4. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +/* This password hashing algorithm was designed by David Mazieres + * <dm@lcs.mit.edu> and works as follows: + * + * 1. state := InitState () + * 2. state := ExpandKey (state, salt, password) + * 3. REPEAT rounds: + * state := ExpandKey (state, 0, password) + * state := ExpandKey (state, 0, salt) + * 4. ctext := "OrpheanBeholderScryDoubt" + * 5. REPEAT 64: + * ctext := Encrypt_ECB (state, ctext); + * 6. RETURN Concatenate (salt, ctext); + * + */ + +/* + * FreeBSD implementation by Paul Herman <pherman@frenchfries.net> + * and updated by Xin Li <delphij@FreeBSD.org> + */ + +#include <stdio.h> +#include <stdlib.h> +#include <sys/types.h> +#include <string.h> +#include <pwd.h> +#include "blowfish.h" +#include "crypt.h" + +/* This implementation is adaptable to current computing power. + * You can have up to 2^31 rounds which should be enough for some + * time to come. + */ + +#define BCRYPT_VERSION '2' +#define BCRYPT_MAXSALT 16 /* Precomputation is just so nice */ +#define BCRYPT_BLOCKS 6 /* Ciphertext blocks */ +#define BCRYPT_MINLOGROUNDS 4 /* we have log2(rounds) in salt */ + + +static void encode_base64(u_int8_t *, u_int8_t *, u_int16_t); +static void decode_base64(u_int8_t *, u_int16_t, const u_int8_t *); + +static char encrypted[_PASSWORD_LEN]; + +const static u_int8_t Base64Code[] = +"./ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"; + +const static u_int8_t index_64[128] = { + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 0, 1, 54, 55, + 56, 57, 58, 59, 60, 61, 62, 63, 255, 255, + 255, 255, 255, 255, 255, 2, 3, 4, 5, 6, + 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, + 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, + 255, 255, 255, 255, 255, 255, 28, 29, 30, + 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, + 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, + 51, 52, 53, 255, 255, 255, 255, 255 +}; +#define CHAR64(c) ( (c) > 127 ? 255 : index_64[(c)]) + +static void +decode_base64(u_int8_t *buffer, u_int16_t len, const u_int8_t *data) +{ + u_int8_t *bp = buffer; + const u_int8_t *p = data; + u_int8_t c1, c2, c3, c4; + while (bp < buffer + len) { + c1 = CHAR64(*p); + c2 = CHAR64(*(p + 1)); + + /* Invalid data */ + if (c1 == 255 || c2 == 255) + break; + + *bp++ = (c1 << 2) | ((c2 & 0x30) >> 4); + if (bp >= buffer + len) + break; + + c3 = CHAR64(*(p + 2)); + if (c3 == 255) + break; + + *bp++ = ((c2 & 0x0f) << 4) | ((c3 & 0x3c) >> 2); + if (bp >= buffer + len) + break; + + c4 = CHAR64(*(p + 3)); + if (c4 == 255) + break; + *bp++ = ((c3 & 0x03) << 6) | c4; + + p += 4; + } +} + +/* We handle $Vers$log2(NumRounds)$salt+passwd$ + i.e. $2$04$iwouldntknowwhattosayetKdJ6iFtacBqJdKe6aW7ou */ + +char * +crypt_blowfish(const char *key, const char *salt) +{ + blf_ctx state; + u_int32_t rounds, i, k; + u_int16_t j; + size_t key_len; + u_int8_t salt_len, logr, minr; + u_int8_t ciphertext[4 * BCRYPT_BLOCKS] = "OrpheanBeholderScryDoubt"; + u_int8_t csalt[BCRYPT_MAXSALT]; + u_int32_t cdata[BCRYPT_BLOCKS]; + char arounds[3]; + + /* Defaults */ + minr = 'b'; + logr = BCRYPT_MINLOGROUNDS; + rounds = 1U << logr; + + if (*salt == '$') { + /* Discard "$" identifier */ + salt++; + + if (*salt > BCRYPT_VERSION) { + /* How do I handle errors ? Return NULL */ + return NULL; + } + + /* Check for minor versions */ + if (salt[1] != '$') { + switch (salt[1]) { + case 'a': /* 'ab' should not yield the same as 'abab' */ + case 'b': /* cap input length at 72 bytes */ + case 'y': /* same as 'b', for compatibility + * with openwall crypt_blowfish + */ + minr = salt[1]; + salt++; + break; + default: + return NULL; + } + } else + minr = 0; + + /* Discard version + "$" identifier */ + salt += 2; + + if (salt[2] != '$') + /* Out of sync with passwd entry */ + return NULL; + + memcpy(arounds, salt, sizeof(arounds)); + if (arounds[sizeof(arounds) - 1] != '$') + return NULL; + arounds[sizeof(arounds) - 1] = 0; + logr = strtonum(arounds, BCRYPT_MINLOGROUNDS, 31, NULL); + if (logr == 0) + return NULL; + /* Computer power doesn't increase linearly, 2^x should be fine */ + rounds = 1U << logr; + + /* Discard num rounds + "$" identifier */ + salt += 3; + } + + if (strlen(salt) * 3 / 4 < BCRYPT_MAXSALT) + return NULL; + + /* We dont want the base64 salt but the raw data */ + decode_base64(csalt, BCRYPT_MAXSALT, (const u_int8_t *) salt); + salt_len = BCRYPT_MAXSALT; + if (minr <= 'a') + key_len = (u_int8_t)(strlen(key) + (minr >= 'a' ? 1 : 0)); + else { + /* strlen() returns a size_t, but the function calls + * below result in implicit casts to a narrower integer + * type, so cap key_len at the actual maximum supported + * length here to avoid integer wraparound */ + key_len = strlen(key); + if (key_len > 72) + key_len = 72; + key_len++; /* include the NUL */ + } + + /* Setting up S-Boxes and Subkeys */ + Blowfish_initstate(&state); + Blowfish_expandstate(&state, csalt, salt_len, + (const u_int8_t *) key, key_len); + for (k = 0; k < rounds; k++) { + Blowfish_expand0state(&state, (const u_int8_t *) key, key_len); + Blowfish_expand0state(&state, csalt, salt_len); + } + + /* This can be precomputed later */ + j = 0; + for (i = 0; i < BCRYPT_BLOCKS; i++) + cdata[i] = Blowfish_stream2word(ciphertext, 4 * BCRYPT_BLOCKS, &j); + + /* Now do the encryption */ + for (k = 0; k < 64; k++) + blf_enc(&state, cdata, BCRYPT_BLOCKS / 2); + + for (i = 0; i < BCRYPT_BLOCKS; i++) { + ciphertext[4 * i + 3] = cdata[i] & 0xff; + cdata[i] = cdata[i] >> 8; + ciphertext[4 * i + 2] = cdata[i] & 0xff; + cdata[i] = cdata[i] >> 8; + ciphertext[4 * i + 1] = cdata[i] & 0xff; + cdata[i] = cdata[i] >> 8; + ciphertext[4 * i + 0] = cdata[i] & 0xff; + } + + + i = 0; + encrypted[i++] = '$'; + encrypted[i++] = BCRYPT_VERSION; + if (minr) + encrypted[i++] = minr; + encrypted[i++] = '$'; + + snprintf(encrypted + i, 4, "%2.2u$", logr); + + encode_base64((u_int8_t *) encrypted + i + 3, csalt, BCRYPT_MAXSALT); + encode_base64((u_int8_t *) encrypted + strlen(encrypted), ciphertext, + 4 * BCRYPT_BLOCKS - 1); + memset(&state, 0, sizeof(state)); + memset(ciphertext, 0, sizeof(ciphertext)); + memset(csalt, 0, sizeof(csalt)); + memset(cdata, 0, sizeof(cdata)); + return encrypted; +} + +static void +encode_base64(u_int8_t *buffer, u_int8_t *data, u_int16_t len) +{ + u_int8_t *bp = buffer; + u_int8_t *p = data; + u_int8_t c1, c2; + while (p < data + len) { + c1 = *p++; + *bp++ = Base64Code[(c1 >> 2)]; + c1 = (c1 & 0x03) << 4; + if (p >= data + len) { + *bp++ = Base64Code[c1]; + break; + } + c2 = *p++; + c1 |= (c2 >> 4) & 0x0f; + *bp++ = Base64Code[c1]; + c1 = (c2 & 0x0f) << 2; + if (p >= data + len) { + *bp++ = Base64Code[c1]; + break; + } + c2 = *p++; + c1 |= (c2 >> 6) & 0x03; + *bp++ = Base64Code[c1]; + *bp++ = Base64Code[c2 & 0x3f]; + } + *bp = '\0'; +} +#if 0 +void +main() +{ + char blubber[73]; + char salt[100]; + char *p; + salt[0] = '$'; + salt[1] = BCRYPT_VERSION; + salt[2] = '$'; + + snprintf(salt + 3, 4, "%2.2u$", 5); + + printf("24 bytes of salt: "); + fgets(salt + 6, sizeof(salt) - 6, stdin); + salt[99] = 0; + printf("72 bytes of password: "); + fpurge(stdin); + fgets(blubber, sizeof(blubber), stdin); + blubber[72] = 0; + + p = crypt(blubber, salt); + printf("Passwd entry: %s\n\n", p); + + p = bcrypt_gensalt(5); + printf("Generated salt: %s\n", p); + p = crypt(blubber, p); + printf("Passwd entry: %s\n", p); +} +#endif |
