mirror of
https://github.com/cryb-to/cryb-to.git
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325 lines
10 KiB
C
325 lines
10 KiB
C
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/* RSA.C - RSA routines for RSAREF
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*/
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/* Copyright (C) RSA Laboratories, a division of RSA Data Security,
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Inc., created 1991. All rights reserved.
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*/
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#include "global.h"
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#include "rsaref.h"
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#include "r_random.h"
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#include "rsa.h"
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#include "nn.h"
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static int RSAPublicBlock PROTO_LIST
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((unsigned char *, unsigned int *, unsigned char *, unsigned int,
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R_RSA_PUBLIC_KEY *));
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static int RSAPrivateBlock PROTO_LIST
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((unsigned char *, unsigned int *, unsigned char *, unsigned int,
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R_RSA_PRIVATE_KEY *));
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/* RSA public-key encryption, according to PKCS #1.
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*/
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int RSAPublicEncrypt
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(output, outputLen, input, inputLen, publicKey, randomStruct)
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unsigned char *output; /* output block */
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unsigned int *outputLen; /* length of output block */
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unsigned char *input; /* input block */
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unsigned int inputLen; /* length of input block */
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R_RSA_PUBLIC_KEY *publicKey; /* RSA public key */
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R_RANDOM_STRUCT *randomStruct; /* random structure */
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{
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int status;
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unsigned char byte, pkcsBlock[MAX_RSA_MODULUS_LEN];
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unsigned int i, modulusLen;
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modulusLen = (publicKey->bits + 7) / 8;
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if (inputLen + 11 > modulusLen)
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return (RE_LEN);
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pkcsBlock[0] = 0;
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/* block type 2 */
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pkcsBlock[1] = 2;
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for (i = 2; i < modulusLen - inputLen - 1; i++) {
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/* Find nonzero random byte.
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*/
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do {
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R_GenerateBytes (&byte, 1, randomStruct);
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} while (byte == 0);
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pkcsBlock[i] = byte;
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}
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/* separator */
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pkcsBlock[i++] = 0;
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R_memcpy ((POINTER)&pkcsBlock[i], (POINTER)input, inputLen);
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status = RSAPublicBlock
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(output, outputLen, pkcsBlock, modulusLen, publicKey);
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/* Zeroize sensitive information.
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*/
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byte = 0;
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R_memset ((POINTER)pkcsBlock, 0, sizeof (pkcsBlock));
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return (status);
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}
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/* RSA public-key decryption, according to PKCS #1.
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*/
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int RSAPublicDecrypt (output, outputLen, input, inputLen, publicKey)
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unsigned char *output; /* output block */
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unsigned int *outputLen; /* length of output block */
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unsigned char *input; /* input block */
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unsigned int inputLen; /* length of input block */
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R_RSA_PUBLIC_KEY *publicKey; /* RSA public key */
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{
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int status;
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unsigned char pkcsBlock[MAX_RSA_MODULUS_LEN];
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unsigned int i, modulusLen, pkcsBlockLen;
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modulusLen = (publicKey->bits + 7) / 8;
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if (inputLen > modulusLen)
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return (RE_LEN);
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if ((status = RSAPublicBlock
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(pkcsBlock, &pkcsBlockLen, input, inputLen, publicKey)))
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return (status);
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if (pkcsBlockLen != modulusLen)
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return (RE_LEN);
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/* Require block type 1.
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*/
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if ((pkcsBlock[0] != 0) || (pkcsBlock[1] != 1))
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return (RE_DATA);
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for (i = 2; i < modulusLen-1; i++)
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if (pkcsBlock[i] != 0xff)
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break;
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/* separator */
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if (pkcsBlock[i++] != 0)
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return (RE_DATA);
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*outputLen = modulusLen - i;
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if (*outputLen + 11 > modulusLen)
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return (RE_DATA);
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R_memcpy ((POINTER)output, (POINTER)&pkcsBlock[i], *outputLen);
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/* Zeroize potentially sensitive information.
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*/
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R_memset ((POINTER)pkcsBlock, 0, sizeof (pkcsBlock));
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return (0);
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}
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/* RSA private-key encryption, according to PKCS #1.
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*/
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int RSAPrivateEncrypt (output, outputLen, input, inputLen, privateKey)
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unsigned char *output; /* output block */
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unsigned int *outputLen; /* length of output block */
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unsigned char *input; /* input block */
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unsigned int inputLen; /* length of input block */
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R_RSA_PRIVATE_KEY *privateKey; /* RSA private key */
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{
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int status;
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unsigned char pkcsBlock[MAX_RSA_MODULUS_LEN];
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unsigned int i, modulusLen;
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modulusLen = (privateKey->bits + 7) / 8;
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if (inputLen + 11 > modulusLen)
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return (RE_LEN);
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pkcsBlock[0] = 0;
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/* block type 1 */
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pkcsBlock[1] = 1;
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for (i = 2; i < modulusLen - inputLen - 1; i++)
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pkcsBlock[i] = 0xff;
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/* separator */
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pkcsBlock[i++] = 0;
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R_memcpy ((POINTER)&pkcsBlock[i], (POINTER)input, inputLen);
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status = RSAPrivateBlock
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(output, outputLen, pkcsBlock, modulusLen, privateKey);
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/* Zeroize potentially sensitive information.
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*/
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R_memset ((POINTER)pkcsBlock, 0, sizeof (pkcsBlock));
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return (status);
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}
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/* RSA private-key decryption, according to PKCS #1.
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*/
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int RSAPrivateDecrypt (output, outputLen, input, inputLen, privateKey)
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unsigned char *output; /* output block */
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unsigned int *outputLen; /* length of output block */
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unsigned char *input; /* input block */
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unsigned int inputLen; /* length of input block */
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R_RSA_PRIVATE_KEY *privateKey; /* RSA private key */
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{
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int status;
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unsigned char pkcsBlock[MAX_RSA_MODULUS_LEN];
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unsigned int i, modulusLen, pkcsBlockLen;
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modulusLen = (privateKey->bits + 7) / 8;
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if (inputLen > modulusLen)
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return (RE_LEN);
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if ((status = RSAPrivateBlock
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(pkcsBlock, &pkcsBlockLen, input, inputLen, privateKey)))
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return (status);
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if (pkcsBlockLen != modulusLen)
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return (RE_LEN);
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/* Require block type 2.
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*/
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if ((pkcsBlock[0] != 0) || (pkcsBlock[1] != 2))
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return (RE_DATA);
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for (i = 2; i < modulusLen-1; i++)
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/* separator */
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if (pkcsBlock[i] == 0)
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break;
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i++;
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if (i >= modulusLen)
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return (RE_DATA);
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*outputLen = modulusLen - i;
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if (*outputLen + 11 > modulusLen)
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return (RE_DATA);
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R_memcpy ((POINTER)output, (POINTER)&pkcsBlock[i], *outputLen);
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/* Zeroize sensitive information.
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*/
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R_memset ((POINTER)pkcsBlock, 0, sizeof (pkcsBlock));
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return (0);
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}
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/* Raw RSA public-key operation. Output has same length as modulus.
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Assumes inputLen < length of modulus.
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Requires input < modulus.
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*/
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static int RSAPublicBlock (output, outputLen, input, inputLen, publicKey)
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unsigned char *output; /* output block */
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unsigned int *outputLen; /* length of output block */
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unsigned char *input; /* input block */
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unsigned int inputLen; /* length of input block */
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R_RSA_PUBLIC_KEY *publicKey; /* RSA public key */
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{
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NN_DIGIT c[MAX_NN_DIGITS], e[MAX_NN_DIGITS], m[MAX_NN_DIGITS],
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n[MAX_NN_DIGITS];
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unsigned int eDigits, nDigits;
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NN_Decode (m, MAX_NN_DIGITS, input, inputLen);
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NN_Decode (n, MAX_NN_DIGITS, publicKey->modulus, MAX_RSA_MODULUS_LEN);
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NN_Decode (e, MAX_NN_DIGITS, publicKey->exponent, MAX_RSA_MODULUS_LEN);
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nDigits = NN_Digits (n, MAX_NN_DIGITS);
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eDigits = NN_Digits (e, MAX_NN_DIGITS);
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if (NN_Cmp (m, n, nDigits) >= 0)
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return (RE_DATA);
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/* Compute c = m^e mod n.
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*/
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NN_ModExp (c, m, e, eDigits, n, nDigits);
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*outputLen = (publicKey->bits + 7) / 8;
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NN_Encode (output, *outputLen, c, nDigits);
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/* Zeroize sensitive information.
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*/
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R_memset ((POINTER)c, 0, sizeof (c));
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R_memset ((POINTER)m, 0, sizeof (m));
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return (0);
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}
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/* Raw RSA private-key operation. Output has same length as modulus.
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Assumes inputLen < length of modulus.
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Requires input < modulus.
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*/
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static int RSAPrivateBlock (output, outputLen, input, inputLen, privateKey)
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unsigned char *output; /* output block */
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unsigned int *outputLen; /* length of output block */
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unsigned char *input; /* input block */
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unsigned int inputLen; /* length of input block */
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R_RSA_PRIVATE_KEY *privateKey; /* RSA private key */
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{
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NN_DIGIT c[MAX_NN_DIGITS], cP[MAX_NN_DIGITS], cQ[MAX_NN_DIGITS],
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dP[MAX_NN_DIGITS], dQ[MAX_NN_DIGITS], mP[MAX_NN_DIGITS],
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mQ[MAX_NN_DIGITS], n[MAX_NN_DIGITS], p[MAX_NN_DIGITS], q[MAX_NN_DIGITS],
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qInv[MAX_NN_DIGITS], t[MAX_NN_DIGITS];
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unsigned int cDigits, nDigits, pDigits;
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NN_Decode (c, MAX_NN_DIGITS, input, inputLen);
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NN_Decode (n, MAX_NN_DIGITS, privateKey->modulus, MAX_RSA_MODULUS_LEN);
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NN_Decode (p, MAX_NN_DIGITS, privateKey->prime[0], MAX_RSA_PRIME_LEN);
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NN_Decode (q, MAX_NN_DIGITS, privateKey->prime[1], MAX_RSA_PRIME_LEN);
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NN_Decode
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(dP, MAX_NN_DIGITS, privateKey->primeExponent[0], MAX_RSA_PRIME_LEN);
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NN_Decode
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(dQ, MAX_NN_DIGITS, privateKey->primeExponent[1], MAX_RSA_PRIME_LEN);
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NN_Decode (qInv, MAX_NN_DIGITS, privateKey->coefficient, MAX_RSA_PRIME_LEN);
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cDigits = NN_Digits (c, MAX_NN_DIGITS);
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nDigits = NN_Digits (n, MAX_NN_DIGITS);
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pDigits = NN_Digits (p, MAX_NN_DIGITS);
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if (NN_Cmp (c, n, nDigits) >= 0)
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return (RE_DATA);
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/* Compute mP = cP^dP mod p and mQ = cQ^dQ mod q. (Assumes q has
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length at most pDigits, i.e., p > q.)
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*/
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NN_Mod (cP, c, cDigits, p, pDigits);
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NN_Mod (cQ, c, cDigits, q, pDigits);
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NN_ModExp (mP, cP, dP, pDigits, p, pDigits);
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NN_AssignZero (mQ, nDigits);
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NN_ModExp (mQ, cQ, dQ, pDigits, q, pDigits);
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/* Chinese Remainder Theorem:
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m = ((((mP - mQ) mod p) * qInv) mod p) * q + mQ.
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*/
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if (NN_Cmp (mP, mQ, pDigits) >= 0)
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NN_Sub (t, mP, mQ, pDigits);
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else {
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NN_Sub (t, mQ, mP, pDigits);
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NN_Sub (t, p, t, pDigits);
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}
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NN_ModMult (t, t, qInv, p, pDigits);
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NN_Mult (t, t, q, pDigits);
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NN_Add (t, t, mQ, nDigits);
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*outputLen = (privateKey->bits + 7) / 8;
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NN_Encode (output, *outputLen, t, nDigits);
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/* Zeroize sensitive information.
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*/
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R_memset ((POINTER)c, 0, sizeof (c));
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R_memset ((POINTER)cP, 0, sizeof (cP));
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R_memset ((POINTER)cQ, 0, sizeof (cQ));
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R_memset ((POINTER)dP, 0, sizeof (dP));
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R_memset ((POINTER)dQ, 0, sizeof (dQ));
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R_memset ((POINTER)mP, 0, sizeof (mP));
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R_memset ((POINTER)mQ, 0, sizeof (mQ));
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R_memset ((POINTER)p, 0, sizeof (p));
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R_memset ((POINTER)q, 0, sizeof (q));
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R_memset ((POINTER)qInv, 0, sizeof (qInv));
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R_memset ((POINTER)t, 0, sizeof (t));
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return (0);
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}
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