src/usr.bin/ssh/cipher.c - diff

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Diff for /src/usr.bin/ssh/cipher.c between version 1.50 and 1.51

version 1.50, 2002/01/21 22:30:12

version 1.51, 2002/02/14 23:41:01

Line 43

#include <openssl/md5.h>

struct Cipher {

char *name;

int number; /* for ssh1 only */

u_int block_size;

u_int key_len;

void (*setkey)(CipherContext *, const u_char *, u_int);

void (*setiv)(CipherContext *, const u_char *, u_int);

void (*encrypt)(CipherContext *, u_char *, const u_char *, u_int);

void (*decrypt)(CipherContext *, u_char *, const u_char *, u_int);

};

/* no encryption */

static void

none_setkey(CipherContext *cc, const u_char *key, u_int keylen)

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/*--*/

u_int

cipher_blocksize(Cipher *c)

{

return (c->block_size);

}

u_int

cipher_keylen(Cipher *c)

{

return (c->key_len);

}

u_int

cipher_mask_ssh1(int client)

{

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}

void

cipher_init(CipherContext *cc, Cipher *cipher,

cipher_init(CipherContext *cc, Cipher *cipher, const u_char *key,

const u_char *key, u_int keylen, const u_char *iv, u_int ivlen)

u_int keylen, const u_char *iv, u_int ivlen, int encrypt)

{

if (keylen < cipher->key_len)

fatal("cipher_init: key length %d is insufficient for %s.",

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fatal("cipher_init: iv length %d is insufficient for %s.",

ivlen, cipher->name);

cc->cipher = cipher;

cc->encrypt = (encrypt == CIPHER_ENCRYPT);

cipher->setkey(cc, key, keylen);

cipher->setiv(cc, iv, ivlen);

}

void

cipher_encrypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len)

cipher_crypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len)

{

if (len % cc->cipher->block_size)

fatal("cipher_encrypt: bad plaintext length %d", len);

cc->cipher->encrypt(cc, dest, src, len);

if (cc->encrypt)

cc->cipher->encrypt(cc, dest, src, len);

else

cc->cipher->decrypt(cc, dest, src, len);

}

void

cipher_decrypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len)

cipher_cleanup(CipherContext *cc)

{

if (len % cc->cipher->block_size)

memset(cc, 0, sizeof(*cc));

fatal("cipher_decrypt: bad ciphertext length %d", len);

cc->cipher->decrypt(cc, dest, src, len);

}

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void

cipher_set_key_string(CipherContext *cc, Cipher *cipher,

const char *passphrase)

const char *passphrase, int encrypt)

{

MD5_CTX md;

u_char digest[16];

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MD5_Update(&md, (const u_char *)passphrase, strlen(passphrase));

MD5_Final(digest, &md);

cipher_init(cc, cipher, digest, 16, NULL, 0);

cipher_init(cc, cipher, digest, 16, NULL, 0, encrypt);

memset(digest, 0, sizeof(digest));

memset(&md, 0, sizeof(md));