diff options
Diffstat (limited to 'src/gcrypt/kw_aes.c')
-rw-r--r-- | src/gcrypt/kw_aes.c | 593 |
1 files changed, 593 insertions, 0 deletions
diff --git a/src/gcrypt/kw_aes.c b/src/gcrypt/kw_aes.c new file mode 100644 index 00000000..38ac8956 --- /dev/null +++ b/src/gcrypt/kw_aes.c @@ -0,0 +1,593 @@ +/** + * + * XMLSec library + * + * AES Algorithm support + * + * This is free software; see Copyright file in the source + * distribution for preciese wording. + * + * Copyright (C) 2010 Aleksey Sanin <aleksey@aleksey.com> + */ +#ifndef XMLSEC_NO_AES +#include "globals.h" + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> + +#include <gcrypt.h> + +#include <xmlsec/xmlsec.h> +#include <xmlsec/xmltree.h> +#include <xmlsec/keys.h> +#include <xmlsec/transforms.h> +#include <xmlsec/errors.h> + +#include <xmlsec/gcrypt/crypto.h> + +#include "../kw_aes_des.h" + + +/********************************************************************* + * + * AES KW implementation + * + *********************************************************************/ +static int xmlSecGCryptKWAesBlockEncrypt (const xmlSecByte * in, + xmlSecSize inSize, + xmlSecByte * out, + xmlSecSize outSize, + void * context); +static int xmlSecGCryptKWAesBlockDecrypt (const xmlSecByte * in, + xmlSecSize inSize, + xmlSecByte * out, + xmlSecSize outSize, + void * context); +static xmlSecKWAesKlass xmlSecGCryptKWAesKlass = { + /* callbacks */ + xmlSecGCryptKWAesBlockEncrypt, /* xmlSecKWAesBlockEncryptMethod encrypt; */ + xmlSecGCryptKWAesBlockDecrypt, /* xmlSecKWAesBlockDecryptMethod decrypt; */ + + /* for the future */ + NULL, /* void* reserved0; */ + NULL /* void* reserved1; */ +}; + + +/********************************************************************* + * + * AES KW transforms + * + ********************************************************************/ +typedef struct _xmlSecGCryptKWAesCtx xmlSecGCryptKWAesCtx, + *xmlSecGCryptKWAesCtxPtr; +struct _xmlSecGCryptKWAesCtx { + int cipher; + int mode; + int flags; + xmlSecSize blockSize; + xmlSecSize keyExpectedSize; + + xmlSecBuffer keyBuffer; +}; +#define xmlSecGCryptKWAesSize \ + (sizeof(xmlSecTransform) + sizeof(xmlSecGCryptKWAesCtx)) +#define xmlSecGCryptKWAesGetCtx(transform) \ + ((xmlSecGCryptKWAesCtxPtr)(((xmlSecByte*)(transform)) + sizeof(xmlSecTransform))) +#define xmlSecGCryptKWAesCheckId(transform) \ + (xmlSecTransformCheckId((transform), xmlSecGCryptTransformKWAes128Id) || \ + xmlSecTransformCheckId((transform), xmlSecGCryptTransformKWAes192Id) || \ + xmlSecTransformCheckId((transform), xmlSecGCryptTransformKWAes256Id)) + +static int xmlSecGCryptKWAesInitialize (xmlSecTransformPtr transform); +static void xmlSecGCryptKWAesFinalize (xmlSecTransformPtr transform); +static int xmlSecGCryptKWAesSetKeyReq (xmlSecTransformPtr transform, + xmlSecKeyReqPtr keyReq); +static int xmlSecGCryptKWAesSetKey (xmlSecTransformPtr transform, + xmlSecKeyPtr key); +static int xmlSecGCryptKWAesExecute (xmlSecTransformPtr transform, + int last, + xmlSecTransformCtxPtr transformCtx); + +static int +xmlSecGCryptKWAesInitialize(xmlSecTransformPtr transform) { + xmlSecGCryptKWAesCtxPtr ctx; + int ret; + + xmlSecAssert2(xmlSecGCryptKWAesCheckId(transform), -1); + xmlSecAssert2(xmlSecTransformCheckSize(transform, xmlSecGCryptKWAesSize), -1); + + ctx = xmlSecGCryptKWAesGetCtx(transform); + xmlSecAssert2(ctx != NULL, -1); + + if(xmlSecTransformCheckId(transform, xmlSecGCryptTransformKWAes128Id)) { + ctx->cipher = GCRY_CIPHER_AES128; + ctx->keyExpectedSize = XMLSEC_KW_AES128_KEY_SIZE; + } else if(xmlSecTransformCheckId(transform, xmlSecGCryptTransformKWAes192Id)) { + ctx->cipher = GCRY_CIPHER_AES192; + ctx->keyExpectedSize = XMLSEC_KW_AES192_KEY_SIZE; + } else if(xmlSecTransformCheckId(transform, xmlSecGCryptTransformKWAes256Id)) { + ctx->cipher = GCRY_CIPHER_AES256; + ctx->keyExpectedSize = XMLSEC_KW_AES256_KEY_SIZE; + } else { + xmlSecError(XMLSEC_ERRORS_HERE, + xmlSecErrorsSafeString(xmlSecTransformGetName(transform)), + NULL, + XMLSEC_ERRORS_R_INVALID_TRANSFORM, + XMLSEC_ERRORS_NO_MESSAGE); + return(-1); + } + ctx->mode = GCRY_CIPHER_MODE_CBC; + ctx->flags = GCRY_CIPHER_SECURE; /* we are paranoid */ + ctx->blockSize = gcry_cipher_get_algo_blklen(ctx->cipher); + xmlSecAssert2(ctx->blockSize > 0, -1); + + ret = xmlSecBufferInitialize(&(ctx->keyBuffer), 0); + if(ret < 0) { + xmlSecError(XMLSEC_ERRORS_HERE, + xmlSecErrorsSafeString(xmlSecTransformGetName(transform)), + "xmlSecGCryptKWAesGetKey", + XMLSEC_ERRORS_R_XMLSEC_FAILED, + XMLSEC_ERRORS_NO_MESSAGE); + return(-1); + } + + return(0); +} + +static void +xmlSecGCryptKWAesFinalize(xmlSecTransformPtr transform) { + xmlSecGCryptKWAesCtxPtr ctx; + + xmlSecAssert(xmlSecGCryptKWAesCheckId(transform)); + xmlSecAssert(xmlSecTransformCheckSize(transform, xmlSecGCryptKWAesSize)); + + ctx = xmlSecGCryptKWAesGetCtx(transform); + xmlSecAssert(ctx != NULL); + + xmlSecBufferFinalize(&(ctx->keyBuffer)); +} + +static int +xmlSecGCryptKWAesSetKeyReq(xmlSecTransformPtr transform, xmlSecKeyReqPtr keyReq) { + xmlSecGCryptKWAesCtxPtr ctx; + + xmlSecAssert2(xmlSecGCryptKWAesCheckId(transform), -1); + xmlSecAssert2((transform->operation == xmlSecTransformOperationEncrypt) || (transform->operation == xmlSecTransformOperationDecrypt), -1); + xmlSecAssert2(xmlSecTransformCheckSize(transform, xmlSecGCryptKWAesSize), -1); + xmlSecAssert2(keyReq != NULL, -1); + + ctx = xmlSecGCryptKWAesGetCtx(transform); + xmlSecAssert2(ctx != NULL, -1); + + keyReq->keyId = xmlSecGCryptKeyDataAesId; + keyReq->keyType = xmlSecKeyDataTypeSymmetric; + if(transform->operation == xmlSecTransformOperationEncrypt) { + keyReq->keyUsage = xmlSecKeyUsageEncrypt; + } else { + keyReq->keyUsage = xmlSecKeyUsageDecrypt; + } + keyReq->keyBitsSize = 8 * ctx->keyExpectedSize; + + return(0); +} + +static int +xmlSecGCryptKWAesSetKey(xmlSecTransformPtr transform, xmlSecKeyPtr key) { + xmlSecGCryptKWAesCtxPtr ctx; + xmlSecBufferPtr buffer; + xmlSecSize keySize; + int ret; + + xmlSecAssert2(xmlSecGCryptKWAesCheckId(transform), -1); + xmlSecAssert2((transform->operation == xmlSecTransformOperationEncrypt) || (transform->operation == xmlSecTransformOperationDecrypt), -1); + xmlSecAssert2(xmlSecTransformCheckSize(transform, xmlSecGCryptKWAesSize), -1); + xmlSecAssert2(key != NULL, -1); + xmlSecAssert2(xmlSecKeyDataCheckId(xmlSecKeyGetValue(key), xmlSecGCryptKeyDataAesId), -1); + + ctx = xmlSecGCryptKWAesGetCtx(transform); + xmlSecAssert2(ctx != NULL, -1); + + buffer = xmlSecKeyDataBinaryValueGetBuffer(xmlSecKeyGetValue(key)); + xmlSecAssert2(buffer != NULL, -1); + + keySize = xmlSecBufferGetSize(buffer); + if(keySize < ctx->keyExpectedSize) { + xmlSecError(XMLSEC_ERRORS_HERE, + xmlSecErrorsSafeString(xmlSecTransformGetName(transform)), + NULL, + XMLSEC_ERRORS_R_INVALID_KEY_DATA_SIZE, + "key=%d;expected=%d", + keySize, ctx->keyExpectedSize); + return(-1); + } + + ret = xmlSecBufferSetData(&(ctx->keyBuffer), + xmlSecBufferGetData(buffer), + ctx->keyExpectedSize); + if(ret < 0) { + xmlSecError(XMLSEC_ERRORS_HERE, + xmlSecErrorsSafeString(xmlSecTransformGetName(transform)), + "xmlSecBufferSetData", + XMLSEC_ERRORS_R_XMLSEC_FAILED, + "expected-size=%d", + ctx->keyExpectedSize); + return(-1); + } + + return(0); +} + +static int +xmlSecGCryptKWAesExecute(xmlSecTransformPtr transform, int last, xmlSecTransformCtxPtr transformCtx) { + xmlSecGCryptKWAesCtxPtr ctx; + xmlSecBufferPtr in, out; + xmlSecSize inSize, outSize, keySize; + int ret; + + xmlSecAssert2(xmlSecGCryptKWAesCheckId(transform), -1); + xmlSecAssert2((transform->operation == xmlSecTransformOperationEncrypt) || (transform->operation == xmlSecTransformOperationDecrypt), -1); + xmlSecAssert2(xmlSecTransformCheckSize(transform, xmlSecGCryptKWAesSize), -1); + xmlSecAssert2(transformCtx != NULL, -1); + + ctx = xmlSecGCryptKWAesGetCtx(transform); + xmlSecAssert2(ctx != NULL, -1); + + keySize = xmlSecBufferGetSize(&(ctx->keyBuffer)); + xmlSecAssert2(keySize == ctx->keyExpectedSize, -1); + + in = &(transform->inBuf); + out = &(transform->outBuf); + inSize = xmlSecBufferGetSize(in); + outSize = xmlSecBufferGetSize(out); + xmlSecAssert2(outSize == 0, -1); + + if(transform->status == xmlSecTransformStatusNone) { + transform->status = xmlSecTransformStatusWorking; + } + + if((transform->status == xmlSecTransformStatusWorking) && (last == 0)) { + /* just do nothing */ + } else if((transform->status == xmlSecTransformStatusWorking) && (last != 0)) { + if((inSize % 8) != 0) { + xmlSecError(XMLSEC_ERRORS_HERE, + xmlSecErrorsSafeString(xmlSecTransformGetName(transform)), + NULL, + XMLSEC_ERRORS_R_INVALID_SIZE, + "size=%d(not 8 bytes aligned)", inSize); + return(-1); + } + + if(transform->operation == xmlSecTransformOperationEncrypt) { + /* the encoded key might be 8 bytes longer plus 8 bytes just in case */ + outSize = inSize + XMLSEC_KW_AES_MAGIC_BLOCK_SIZE + + XMLSEC_KW_AES_BLOCK_SIZE; + } else { + outSize = inSize + XMLSEC_KW_AES_BLOCK_SIZE; + } + + ret = xmlSecBufferSetMaxSize(out, outSize); + if(ret < 0) { + xmlSecError(XMLSEC_ERRORS_HERE, + xmlSecErrorsSafeString(xmlSecTransformGetName(transform)), + "xmlSecBufferSetMaxSize", + XMLSEC_ERRORS_R_XMLSEC_FAILED, + "outSize=%d", outSize); + return(-1); + } + + if(transform->operation == xmlSecTransformOperationEncrypt) { + ret = xmlSecKWAesEncode(&xmlSecGCryptKWAesKlass, ctx, + xmlSecBufferGetData(in), inSize, + xmlSecBufferGetData(out), outSize); + if(ret < 0) { + xmlSecError(XMLSEC_ERRORS_HERE, + xmlSecErrorsSafeString(xmlSecTransformGetName(transform)), + "xmlSecKWAesEncode", + XMLSEC_ERRORS_R_XMLSEC_FAILED, + XMLSEC_ERRORS_NO_MESSAGE); + return(-1); + } + outSize = ret; + } else { + ret = xmlSecKWAesDecode(&xmlSecGCryptKWAesKlass, ctx, + xmlSecBufferGetData(in), inSize, + xmlSecBufferGetData(out), outSize); + if(ret < 0) { + xmlSecError(XMLSEC_ERRORS_HERE, + xmlSecErrorsSafeString(xmlSecTransformGetName(transform)), + "xmlSecKWAesEncode", + XMLSEC_ERRORS_R_XMLSEC_FAILED, + XMLSEC_ERRORS_NO_MESSAGE); + return(-1); + } + outSize = ret; + } + + ret = xmlSecBufferSetSize(out, outSize); + if(ret < 0) { + xmlSecError(XMLSEC_ERRORS_HERE, + xmlSecErrorsSafeString(xmlSecTransformGetName(transform)), + "xmlSecBufferSetSize", + XMLSEC_ERRORS_R_XMLSEC_FAILED, + "outSize=%d", outSize); + return(-1); + } + + ret = xmlSecBufferRemoveHead(in, inSize); + if(ret < 0) { + xmlSecError(XMLSEC_ERRORS_HERE, + xmlSecErrorsSafeString(xmlSecTransformGetName(transform)), + "xmlSecBufferRemoveHead", + XMLSEC_ERRORS_R_XMLSEC_FAILED, + "inSize%d", inSize); + return(-1); + } + + transform->status = xmlSecTransformStatusFinished; + } else if(transform->status == xmlSecTransformStatusFinished) { + /* the only way we can get here is if there is no input */ + xmlSecAssert2(xmlSecBufferGetSize(&(transform->inBuf)) == 0, -1); + } else { + xmlSecError(XMLSEC_ERRORS_HERE, + xmlSecErrorsSafeString(xmlSecTransformGetName(transform)), + NULL, + XMLSEC_ERRORS_R_INVALID_STATUS, + "status=%d", transform->status); + return(-1); + } + return(0); +} + + +static xmlSecTransformKlass xmlSecGCryptKWAes128Klass = { + /* klass/object sizes */ + sizeof(xmlSecTransformKlass), /* xmlSecSize klassSize */ + xmlSecGCryptKWAesSize, /* xmlSecSize objSize */ + + xmlSecNameKWAes128, /* const xmlChar* name; */ + xmlSecHrefKWAes128, /* const xmlChar* href; */ + xmlSecTransformUsageEncryptionMethod, /* xmlSecAlgorithmUsage usage; */ + + xmlSecGCryptKWAesInitialize, /* xmlSecTransformInitializeMethod initialize; */ + xmlSecGCryptKWAesFinalize, /* xmlSecTransformFinalizeMethod finalize; */ + NULL, /* xmlSecTransformNodeReadMethod readNode; */ + NULL, /* xmlSecTransformNodeWriteMethod writeNode; */ + xmlSecGCryptKWAesSetKeyReq, /* xmlSecTransformSetKeyMethod setKeyReq; */ + xmlSecGCryptKWAesSetKey, /* xmlSecTransformSetKeyMethod setKey; */ + NULL, /* xmlSecTransformValidateMethod validate; */ + xmlSecTransformDefaultGetDataType, /* xmlSecTransformGetDataTypeMethod getDataType; */ + xmlSecTransformDefaultPushBin, /* xmlSecTransformPushBinMethod pushBin; */ + xmlSecTransformDefaultPopBin, /* xmlSecTransformPopBinMethod popBin; */ + NULL, /* xmlSecTransformPushXmlMethod pushXml; */ + NULL, /* xmlSecTransformPopXmlMethod popXml; */ + xmlSecGCryptKWAesExecute, /* xmlSecTransformExecuteMethod execute; */ + + NULL, /* void* reserved0; */ + NULL, /* void* reserved1; */ +}; + +/** + * xmlSecGCryptTransformKWAes128GetKlass: + * + * The AES-128 kew wrapper transform klass. + * + * Returns: AES-128 kew wrapper transform klass. + */ +xmlSecTransformId +xmlSecGCryptTransformKWAes128GetKlass(void) { + return(&xmlSecGCryptKWAes128Klass); +} + +static xmlSecTransformKlass xmlSecGCryptKWAes192Klass = { + /* klass/object sizes */ + sizeof(xmlSecTransformKlass), /* xmlSecSize klassSize */ + xmlSecGCryptKWAesSize, /* xmlSecSize objSize */ + + xmlSecNameKWAes192, /* const xmlChar* name; */ + xmlSecHrefKWAes192, /* const xmlChar* href; */ + xmlSecTransformUsageEncryptionMethod, /* xmlSecAlgorithmUsage usage; */ + + xmlSecGCryptKWAesInitialize, /* xmlSecTransformInitializeMethod initialize; */ + xmlSecGCryptKWAesFinalize, /* xmlSecTransformFinalizeMethod finalize; */ + NULL, /* xmlSecTransformNodeReadMethod readNode; */ + NULL, /* xmlSecTransformNodeWriteMethod writeNode; */ + xmlSecGCryptKWAesSetKeyReq, /* xmlSecTransformSetKeyMethod setKeyReq; */ + xmlSecGCryptKWAesSetKey, /* xmlSecTransformSetKeyMethod setKey; */ + NULL, /* xmlSecTransformValidateMethod validate; */ + xmlSecTransformDefaultGetDataType, /* xmlSecTransformGetDataTypeMethod getDataType; */ + xmlSecTransformDefaultPushBin, /* xmlSecTransformPushBinMethod pushBin; */ + xmlSecTransformDefaultPopBin, /* xmlSecTransformPopBinMethod popBin; */ + NULL, /* xmlSecTransformPushXmlMethod pushXml; */ + NULL, /* xmlSecTransformPopXmlMethod popXml; */ + xmlSecGCryptKWAesExecute, /* xmlSecTransformExecuteMethod execute; */ + + NULL, /* void* reserved0; */ + NULL, /* void* reserved1; */ +}; + + +/** + * xmlSecGCryptTransformKWAes192GetKlass: + * + * The AES-192 kew wrapper transform klass. + * + * Returns: AES-192 kew wrapper transform klass. + */ +xmlSecTransformId +xmlSecGCryptTransformKWAes192GetKlass(void) { + return(&xmlSecGCryptKWAes192Klass); +} + +static xmlSecTransformKlass xmlSecGCryptKWAes256Klass = { + /* klass/object sizes */ + sizeof(xmlSecTransformKlass), /* xmlSecSize klassSize */ + xmlSecGCryptKWAesSize, /* xmlSecSize objSize */ + + xmlSecNameKWAes256, /* const xmlChar* name; */ + xmlSecHrefKWAes256, /* const xmlChar* href; */ + xmlSecTransformUsageEncryptionMethod, /* xmlSecAlgorithmUsage usage; */ + + xmlSecGCryptKWAesInitialize, /* xmlSecTransformInitializeMethod initialize; */ + xmlSecGCryptKWAesFinalize, /* xmlSecTransformFinalizeMethod finalize; */ + NULL, /* xmlSecTransformNodeReadMethod readNode; */ + NULL, /* xmlSecTransformNodeWriteMethod writeNode; */ + xmlSecGCryptKWAesSetKeyReq, /* xmlSecTransformSetKeyMethod setKeyReq; */ + xmlSecGCryptKWAesSetKey, /* xmlSecTransformSetKeyMethod setKey; */ + NULL, /* xmlSecTransformValidateMethod validate; */ + xmlSecTransformDefaultGetDataType, /* xmlSecTransformGetDataTypeMethod getDataType; */ + xmlSecTransformDefaultPushBin, /* xmlSecTransformPushBinMethod pushBin; */ + xmlSecTransformDefaultPopBin, /* xmlSecTransformPopBinMethod popBin; */ + NULL, /* xmlSecTransformPushXmlMethod pushXml; */ + NULL, /* xmlSecTransformPopXmlMethod popXml; */ + xmlSecGCryptKWAesExecute, /* xmlSecTransformExecuteMethod execute; */ + + NULL, /* void* reserved0; */ + NULL, /* void* reserved1; */ +}; + +/** + * xmlSecGCryptTransformKWAes256GetKlass: + * + * The AES-256 kew wrapper transform klass. + * + * Returns: AES-256 kew wrapper transform klass. + */ +xmlSecTransformId +xmlSecGCryptTransformKWAes256GetKlass(void) { + return(&xmlSecGCryptKWAes256Klass); +} + +/********************************************************************* + * + * AES KW implementation + * + *********************************************************************/ +static unsigned char g_zero_iv[XMLSEC_KW_AES_BLOCK_SIZE] = + { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; +static int +xmlSecGCryptKWAesBlockEncrypt(const xmlSecByte * in, xmlSecSize inSize, + xmlSecByte * out, xmlSecSize outSize, + void * context) { + xmlSecGCryptKWAesCtxPtr ctx = (xmlSecGCryptKWAesCtxPtr)context; + gcry_cipher_hd_t cipherCtx; + gcry_error_t err; + + xmlSecAssert2(ctx != NULL, -1); + xmlSecAssert2(in != NULL, -1); + xmlSecAssert2(inSize >= ctx->blockSize, -1); + xmlSecAssert2(out != NULL, -1); + xmlSecAssert2(outSize >= ctx->blockSize, -1); + + err = gcry_cipher_open(&cipherCtx, ctx->cipher, ctx->mode, ctx->flags); + if(err != GPG_ERR_NO_ERROR) { + xmlSecError(XMLSEC_ERRORS_HERE, + NULL, + "gcry_cipher_open", + XMLSEC_ERRORS_R_CRYPTO_FAILED, + XMLSEC_GCRYPT_REPORT_ERROR(err)); + return(-1); + } + + err = gcry_cipher_setkey(cipherCtx, + xmlSecBufferGetData(&ctx->keyBuffer), + xmlSecBufferGetSize(&ctx->keyBuffer)); + if(err != GPG_ERR_NO_ERROR) { + xmlSecError(XMLSEC_ERRORS_HERE, + NULL, + "gcry_cipher_setkey", + XMLSEC_ERRORS_R_CRYPTO_FAILED, + XMLSEC_GCRYPT_REPORT_ERROR(err)); + return(-1); + } + + /* use zero IV and CBC mode to ensure we get result as-is */ + err = gcry_cipher_setiv(cipherCtx, g_zero_iv, sizeof(g_zero_iv)); + if(err != GPG_ERR_NO_ERROR) { + xmlSecError(XMLSEC_ERRORS_HERE, + NULL, + "gcry_cipher_setiv", + XMLSEC_ERRORS_R_CRYPTO_FAILED, + XMLSEC_GCRYPT_REPORT_ERROR(err)); + return(-1); + } + + err = gcry_cipher_encrypt(cipherCtx, out, outSize, in, inSize); + if(err != GPG_ERR_NO_ERROR) { + xmlSecError(XMLSEC_ERRORS_HERE, + NULL, + "gcry_cipher_encrypt", + XMLSEC_ERRORS_R_CRYPTO_FAILED, + XMLSEC_GCRYPT_REPORT_ERROR(err)); + gcry_cipher_close(cipherCtx); + return(-1); + } + gcry_cipher_close(cipherCtx); + + return(ctx->blockSize); +} + +static int +xmlSecGCryptKWAesBlockDecrypt(const xmlSecByte * in, xmlSecSize inSize, + xmlSecByte * out, xmlSecSize outSize, + void * context) { + xmlSecGCryptKWAesCtxPtr ctx = (xmlSecGCryptKWAesCtxPtr)context; + gcry_cipher_hd_t cipherCtx; + gcry_error_t err; + + xmlSecAssert2(ctx != NULL, -1); + xmlSecAssert2(in != NULL, -1); + xmlSecAssert2(inSize >= ctx->blockSize, -1); + xmlSecAssert2(out != NULL, -1); + xmlSecAssert2(outSize >= ctx->blockSize, -1); + + err = gcry_cipher_open(&cipherCtx, ctx->cipher, ctx->mode, ctx->flags); + if(err != GPG_ERR_NO_ERROR) { + xmlSecError(XMLSEC_ERRORS_HERE, + NULL, + "gcry_cipher_open", + XMLSEC_ERRORS_R_CRYPTO_FAILED, + XMLSEC_GCRYPT_REPORT_ERROR(err)); + return(-1); + } + + err = gcry_cipher_setkey(cipherCtx, + xmlSecBufferGetData(&ctx->keyBuffer), + xmlSecBufferGetSize(&ctx->keyBuffer)); + if(err != GPG_ERR_NO_ERROR) { + xmlSecError(XMLSEC_ERRORS_HERE, + NULL, + "gcry_cipher_setkey", + XMLSEC_ERRORS_R_CRYPTO_FAILED, + XMLSEC_GCRYPT_REPORT_ERROR(err)); + return(-1); + } + + /* use zero IV and CBC mode to ensure we get result as-is */ + err = gcry_cipher_setiv(cipherCtx, g_zero_iv, sizeof(g_zero_iv)); + if(err != GPG_ERR_NO_ERROR) { + xmlSecError(XMLSEC_ERRORS_HERE, + NULL, + "gcry_cipher_setiv", + XMLSEC_ERRORS_R_CRYPTO_FAILED, + XMLSEC_GCRYPT_REPORT_ERROR(err)); + return(-1); + } + + err = gcry_cipher_decrypt(cipherCtx, out, outSize, in, inSize); + if(err != GPG_ERR_NO_ERROR) { + xmlSecError(XMLSEC_ERRORS_HERE, + NULL, + "gcry_cipher_decrypt", + XMLSEC_ERRORS_R_CRYPTO_FAILED, + XMLSEC_GCRYPT_REPORT_ERROR(err)); + gcry_cipher_close(cipherCtx); + return(-1); + } + gcry_cipher_close(cipherCtx); + + return(ctx->blockSize); +} + +#endif /* XMLSEC_NO_AES */ |