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Implement new _libssh2_cipher_* API.

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This commit is contained in:
Simon Josefsson
2007-01-18 11:20:17 +00:00
parent e1bebf979b
commit d3c334c3d6
4 changed files with 141 additions and 0 deletions
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62
src/libgcrypt.c
View File

@@ -151,3 +151,65 @@ int _libssh2_dsa_sha1_verify(libssh2_dsa_ctx *dsactx,
return (rc == 0) ? 0 : -1;
}
int _libssh2_cipher_init (_libssh2_cipher_ctx *h,
_libssh2_cipher_type(algo),
unsigned char *iv,
unsigned char *secret,
int encrypt)
{
int mode = 0, keylen, err;
keylen = gcry_cipher_get_algo_keylen (algo);
if (algo != GCRY_CIPHER_ARCFOUR)
{
mode = GCRY_CIPHER_MODE_CBC;
}
err = gcry_cipher_open (h, algo, mode, 0);
if (err)
{
return -1;
}
err = gcry_cipher_setkey (*h, secret, keylen);
if (err)
{
return -1;
}
if (algo != GCRY_CIPHER_ARCFOUR)
{
int blklen = gcry_cipher_get_algo_blklen (algo);
err = gcry_cipher_setiv (*h, iv, blklen);
if (err)
{
return -1;
}
}
return 0;
}
int _libssh2_cipher_crypt(_libssh2_cipher_ctx *ctx,
_libssh2_cipher_type(algo),
int encrypt,
unsigned char *block)
{
size_t blklen = gcry_cipher_get_algo_blklen (algo);
int err;
if (blklen == 1) {
/* Hack for arcfour. */
blklen = 8;
}
if (encrypt)
{
err = gcry_cipher_encrypt (*ctx, block, blklen,
block, blklen);
}
else
{
err = gcry_cipher_decrypt (*ctx, block, blklen,
block, blklen);
}
return err;
}

24
src/libgcrypt.h
View File

@@ -124,3 +124,27 @@ int _libssh2_dsa_sha1_verify(libssh2_dsa_ctx *dsa,
unsigned long m_len);
#define _libssh2_dsa_free(dsactx) gcry_sexp_release (dsactx)
#define _libssh2_cipher_type(name) int name
#define _libssh2_cipher_ctx gcry_cipher_hd_t
#define _libssh2_cipher_aes256 GCRY_CIPHER_AES256
#define _libssh2_cipher_aes192 GCRY_CIPHER_AES192
#define _libssh2_cipher_aes128 GCRY_CIPHER_AES128
#define _libssh2_cipher_blowfish GCRY_CIPHER_BLOWFISH
#define _libssh2_cipher_arcfour GCRY_CIPHER_ARCFOUR
#define _libssh2_cipher_cast5 GCRY_CIPHER_CAST5
#define _libssh2_cipher_3des GCRY_CIPHER_3DES
int _libssh2_cipher_init (_libssh2_cipher_ctx *h,
_libssh2_cipher_type(algo),
unsigned char *iv,
unsigned char *secret,
int encrypt);
int _libssh2_cipher_crypt(_libssh2_cipher_ctx *ctx,
_libssh2_cipher_type(algo),
int encrypt,
unsigned char *block);
#define _libssh2_cipher_dtor(ctx) gcry_cipher_close(*(ctx))

31
src/openssl.c
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@@ -108,3 +108,34 @@ int _libssh2_dsa_sha1_verify(libssh2_dsa_ctx *dsactx,
return (ret == 1) ? 0 : -1;
}
int _libssh2_cipher_init (_libssh2_cipher_ctx *h,
_libssh2_cipher_type(algo),
unsigned char *iv,
unsigned char *secret,
int encrypt)
{
EVP_CIPHER_CTX_init(h);
EVP_CipherInit(h, algo(), secret, iv, encrypt);
return 0;
}
int _libssh2_cipher_crypt(_libssh2_cipher_ctx *ctx,
_libssh2_cipher_type(algo),
int encrypt,
unsigned char *block)
{
int blocksize = ctx->cipher->block_size;
unsigned char buf[EVP_MAX_BLOCK_LENGTH];
int ret;
if (blocksize == 1) {
/* Hack for arcfour. */
blocksize = 8;
}
ret = EVP_Cipher(ctx, buf, block, blocksize);
if (ret == 1) {
memcpy(block, buf, blocksize);
}
return ret == 1 ? 0 : 1;
}

24
src/openssl.h
View File

@@ -161,3 +161,27 @@ int _libssh2_dsa_sha1_verify(libssh2_dsa_ctx *dsactx,
unsigned long m_len);
#define _libssh2_dsa_free(dsactx) DSA_free(dsactx)
#define _libssh2_cipher_type(name) const EVP_CIPHER *(*name)(void)
#define _libssh2_cipher_ctx EVP_CIPHER_CTX
#define _libssh2_cipher_aes256 EVP_aes_256_cbc
#define _libssh2_cipher_aes192 EVP_aes_192_cbc
#define _libssh2_cipher_aes128 EVP_aes_128_cbc
#define _libssh2_cipher_blowfish EVP_bf_cbc
#define _libssh2_cipher_arcfour EVP_rc4
#define _libssh2_cipher_cast5 EVP_cast5_cbc
#define _libssh2_cipher_3des EVP_des_ede3_cbc
int _libssh2_cipher_init (_libssh2_cipher_ctx *h,
_libssh2_cipher_type(algo),
unsigned char *iv,
unsigned char *secret,
int encrypt);
int _libssh2_cipher_crypt(_libssh2_cipher_ctx *ctx,
_libssh2_cipher_type(algo),
int encrypt,
unsigned char *block);
#define _libssh2_cipher_dtor(ctx) EVP_CIPHER_CTX_cleanup(ctx)