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implement gmp_rsa_private_key.decrypt()

This commit is contained in:
Andreas Steffen 2009-06-08 15:59:33 +02:00 committed by Martin Willi
parent c50ff68d0c
commit d615ffdcf3
2 changed files with 34 additions and 4 deletions
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37
src/libstrongswan/plugins/gmp/gmp_rsa_private_key.c
View File

@ -313,11 +313,40 @@ static bool sign(private_gmp_rsa_private_key_t *this, signature_scheme_t scheme,
/**
* Implementation of gmp_rsa_private_key.decrypt.
*/
static bool decrypt(private_gmp_rsa_private_key_t *this,
chunk_t crypto, chunk_t *plain)
static bool decrypt(private_gmp_rsa_private_key_t *this, chunk_t crypto,
chunk_t *plain)
{
DBG1("RSA private key decryption not implemented");
return FALSE;
chunk_t em, stripped;
bool success = FALSE;
/* rsa decryption using PKCS#1 RSADP */
stripped = em = rsadp(this, crypto);
/* PKCS#1 v1.5 8.1 encryption-block formatting (EB = 00 || 02 || PS || 00 || D) */
/* check for hex pattern 00 02 in decrypted message */
if ((*stripped.ptr++ != 0x00) || (*(stripped.ptr++) != 0x02))
{
DBG1("incorrect padding - probably wrong rsa key");
goto end;
}
stripped.len -= 2;
/* the plaintext data starts after first 0x00 byte */
while (stripped.len-- > 0 && *stripped.ptr++ != 0x00)
if (stripped.len == 0)
{
DBG1("no plaintext data");
goto end;
}
*plain = chunk_clone(stripped);
success = TRUE;
end:
chunk_clear(&em);
return success;
}
/**

1
src/libstrongswan/plugins/gmp/gmp_rsa_public_key.c
View File

@ -377,6 +377,7 @@ static bool encrypt_(private_gmp_rsa_public_key_t *this, chunk_t plain,
memcpy(pos, plain.ptr, plain.len);
DBG3("padded data before rsa encryption: %B", &em);
/* rsa encryption using PKCS#1 RSAEP */
*crypto = rsaep(this, em);
DBG3("rsa encrypted data: %B", crypto);
chunk_clear(&em);