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[crypto] added PEM file read/write helpers

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akallabeth
2023-02-03 14:11:25 +01:00
committed by akallabeth
parent ac037327d5
commit 1d3c6518fa
2 changed files with 76 additions and 0 deletions
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3
include/freerdp/crypto/crypto.h
View File

@@ -40,6 +40,9 @@ extern "C"
FREERDP_API void crypto_base64_decode(const char* enc_data, size_t length, BYTE** dec_data,
size_t* res_length);
FREERDP_API char* crypto_read_pem(const char* filename, size_t* plength);
FREERDP_API BOOL crypto_write_pem(const char* filename, const char* pem, size_t length);
#ifdef __cplusplus
}
#endif

73
libfreerdp/crypto/crypto.c
View File

@@ -17,6 +17,8 @@
* limitations under the License.
*/
#include <errno.h>
#include <openssl/objects.h>
#include <freerdp/config.h>
@@ -182,3 +184,74 @@ void crypto_reverse(BYTE* data, size_t length)
data[j] = temp;
}
}
char* crypto_read_pem(const char* filename, size_t* plength)
{
char* pem = NULL;
FILE* fp = NULL;
WINPR_ASSERT(filename);
if (plength)
*plength = 0;
fp = winpr_fopen(filename, "r");
if (!fp)
goto fail;
const int rs = _fseeki64(fp, 0, SEEK_END);
if (rs < 0)
goto fail;
const SSIZE_T size = _ftelli64(fp);
if (size < 0)
goto fail;
const int rc = _fseeki64(fp, 0, SEEK_SET);
if (rc < 0)
goto fail;
pem = calloc(size + 1, sizeof(char));
if (!pem)
goto fail;
const size_t fr = fread(pem, (size_t)size, 1, fp);
if (fr != 1)
goto fail;
if (plength)
*plength = (size_t)size;
fclose(fp);
return pem;
fail:
{
char buffer[8192] = { 0 };
WLog_WARN(TAG, "Failed to read PEM from file '%s' [%s]", filename,
winpr_strerror(errno, buffer, sizeof(buffer)));
}
fclose(fp);
free(pem);
return NULL;
}
BOOL crypto_write_pem(const char* filename, const char* pem, size_t length)
{
WINPR_ASSERT(filename);
WINPR_ASSERT(pem || (length == 0));
WINPR_ASSERT(filename);
WINPR_ASSERT(pem);
size_t rc = 0, size = strlen(pem) + 1;
FILE* fp = winpr_fopen(filename, "w");
if (!fp)
goto fail;
rc = fwrite(pem, 1, size, fp);
fclose(fp);
fail:
if (rc == 0)
{
char buffer[8192] = { 0 };
WLog_WARN(TAG, "Failed to write PEM [%" PRIuz "] to file '%s' [%s]", length, filename,
winpr_strerror(errno, buffer, sizeof(buffer)));
}
return rc == size;
}