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Merge pull request #5504 from gstrauss/mbedtls_pem_get_der

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Add accessor to get der from mbedtls_pem_context
This commit is contained in:
Gilles Peskine 2022-02-10 23:56:57 +01:00 committed by GitHub
commit bebeae9428
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 48 additions and 7 deletions
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2
ChangeLog.d/mbedtls_pem_get_der.txt Normal file
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@ -0,0 +1,2 @@
Features
* Add accessor to get the raw buffer pointer from a PEM context.

28
include/mbedtls/pem.h
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@ -27,6 +27,11 @@
#include <stddef.h> #include <stddef.h>
#if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
!defined(inline) && !defined(__cplusplus)
#define inline __inline
#endif
/** /**
* \name PEM Error codes * \name PEM Error codes
* These error codes are returned in case of errors reading the * These error codes are returned in case of errors reading the
@ -96,6 +101,10 @@ void mbedtls_pem_init( mbedtls_pem_context *ctx );
* the decrypted text starts with an ASN.1 sequence of * the decrypted text starts with an ASN.1 sequence of
* appropriate length * appropriate length
* *
* \note \c mbedtls_pem_free must be called on PEM context before
* the PEM context can be reused in another call to
* \c mbedtls_pem_read_buffer
*
* \return 0 on success, or a specific PEM error code * \return 0 on success, or a specific PEM error code
*/ */
int mbedtls_pem_read_buffer( mbedtls_pem_context *ctx, const char *header, const char *footer, int mbedtls_pem_read_buffer( mbedtls_pem_context *ctx, const char *header, const char *footer,
@ -103,6 +112,25 @@ int mbedtls_pem_read_buffer( mbedtls_pem_context *ctx, const char *header, const
const unsigned char *pwd, const unsigned char *pwd,
size_t pwdlen, size_t *use_len ); size_t pwdlen, size_t *use_len );
/**
* \brief Get the pointer to the decoded binary data in a PEM context.
*
* \param ctx PEM context to access.
* \param buflen On success, this will contain the length of the binary data.
* This must be a valid (non-null) pointer.
*
* \return A pointer to the decoded binary data.
*
* \note The returned pointer remains valid only until \p ctx is
modified or freed.
*/
static inline const unsigned char *mbedtls_pem_get_buffer( mbedtls_pem_context *ctx, size_t *buflen )
{
*buflen = ctx->MBEDTLS_PRIVATE(buflen);
return( ctx->MBEDTLS_PRIVATE(buf) );
}
/** /**
* \brief PEM context memory freeing * \brief PEM context memory freeing
* *

15
tests/suites/test_suite_pem.data
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@ -16,23 +16,26 @@ mbedtls_pem_write_buffer:"-----START TEST-----\n":"-----END TEST-----\n":"000102
PEM write (exactly two lines + 1) PEM write (exactly two lines + 1)
mbedtls_pem_write_buffer:"-----START TEST-----\n":"-----END TEST-----\n":"000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F00":"-----START TEST-----\nAAECAwQFBgcICQoLDA0ODwABAgMEBQYHCAkKCwwNDg8AAQIDBAUGBwgJCgsMDQ4P\nAAECAwQFBgcICQoLDA0ODwABAgMEBQYHCAkKCwwNDg8AAQIDBAUGBwgJCgsMDQ4P\nAA==\n-----END TEST-----\n" mbedtls_pem_write_buffer:"-----START TEST-----\n":"-----END TEST-----\n":"000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F00":"-----START TEST-----\nAAECAwQFBgcICQoLDA0ODwABAgMEBQYHCAkKCwwNDg8AAQIDBAUGBwgJCgsMDQ4P\nAAECAwQFBgcICQoLDA0ODwABAgMEBQYHCAkKCwwNDg8AAQIDBAUGBwgJCgsMDQ4P\nAA==\n-----END TEST-----\n"
PEM read (unencrypted, valid)
mbedtls_pem_read_buffer:"^":"$":"^\nTWJlZCBUTFM=\n$":"":0:"4d62656420544c53"
PEM read (DES-EDE3-CBC + invalid iv) PEM read (DES-EDE3-CBC + invalid iv)
mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: DES-EDE3-CBC,00$":"pwd":MBEDTLS_ERR_PEM_INVALID_ENC_IV mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: DES-EDE3-CBC,00$":"pwd":MBEDTLS_ERR_PEM_INVALID_ENC_IV:""
PEM read (DES-CBC + invalid iv) PEM read (DES-CBC + invalid iv)
mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: DES-CBC,00$":"pwd":MBEDTLS_ERR_PEM_INVALID_ENC_IV mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: DES-CBC,00$":"pwd":MBEDTLS_ERR_PEM_INVALID_ENC_IV:""
PEM read (unknown encryption algorithm) PEM read (unknown encryption algorithm)
mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: AES-,00$":"pwd":MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: AES-,00$":"pwd":MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG:""
PEM read (malformed PEM DES-CBC) PEM read (malformed PEM DES-CBC)
depends_on:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC depends_on:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC
mbedtls_pem_read_buffer:"-----BEGIN EC PRIVATE KEY-----":"-----END EC PRIVATE KEY-----":"-----BEGIN EC PRIVATE KEY-----\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: DES-CBC,AA94892A169FA426\n\nMAAA\n-----END EC PRIVATE KEY-----":"pwd":MBEDTLS_ERR_DES_INVALID_INPUT_LENGTH mbedtls_pem_read_buffer:"-----BEGIN EC PRIVATE KEY-----":"-----END EC PRIVATE KEY-----":"-----BEGIN EC PRIVATE KEY-----\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: DES-CBC,AA94892A169FA426\n\nMAAA\n-----END EC PRIVATE KEY-----":"pwd":MBEDTLS_ERR_DES_INVALID_INPUT_LENGTH:""
PEM read (malformed PEM DES-EDE3-CBC) PEM read (malformed PEM DES-EDE3-CBC)
depends_on:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC depends_on:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC
mbedtls_pem_read_buffer:"-----BEGIN EC PRIVATE KEY-----":"-----END EC PRIVATE KEY-----":"-----BEGIN EC PRIVATE KEY-----\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: DES-EDE3-CBC,AA94892A169FA426\n\nMAAA\n-----END EC PRIVATE KEY-----":"pwd":MBEDTLS_ERR_DES_INVALID_INPUT_LENGTH mbedtls_pem_read_buffer:"-----BEGIN EC PRIVATE KEY-----":"-----END EC PRIVATE KEY-----":"-----BEGIN EC PRIVATE KEY-----\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: DES-EDE3-CBC,AA94892A169FA426\n\nMAAA\n-----END EC PRIVATE KEY-----":"pwd":MBEDTLS_ERR_DES_INVALID_INPUT_LENGTH:""
PEM read (malformed PEM AES-128-CBC) PEM read (malformed PEM AES-128-CBC)
depends_on:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_CBC depends_on:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_CBC
mbedtls_pem_read_buffer:"-----BEGIN EC PRIVATE KEY-----":"-----END EC PRIVATE KEY-----":"-----BEGIN EC PRIVATE KEY-----\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: AES-128-CBC,AA94892A169FA426AA94892A169FA426\n\nMAAA\n-----END EC PRIVATE KEY-----":"pwd":MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH mbedtls_pem_read_buffer:"-----BEGIN EC PRIVATE KEY-----":"-----END EC PRIVATE KEY-----":"-----BEGIN EC PRIVATE KEY-----\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: AES-128-CBC,AA94892A169FA426AA94892A169FA426\n\nMAAA\n-----END EC PRIVATE KEY-----":"pwd":MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH:""

10
tests/suites/test_suite_pem.function
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@ -34,18 +34,26 @@ exit:
/* BEGIN_CASE depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_AES_C:MBEDTLS_DES_C:MBEDTLS_MD5_C:MBEDTLS_CIPHER_MODE_CBC */ /* BEGIN_CASE depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_AES_C:MBEDTLS_DES_C:MBEDTLS_MD5_C:MBEDTLS_CIPHER_MODE_CBC */
void mbedtls_pem_read_buffer( char *header, char *footer, char *data, void mbedtls_pem_read_buffer( char *header, char *footer, char *data,
char *pwd, int res ) char *pwd, int res, data_t *out )
{ {
mbedtls_pem_context ctx; mbedtls_pem_context ctx;
int ret; int ret;
size_t use_len = 0; size_t use_len = 0;
size_t pwd_len = strlen( pwd ); size_t pwd_len = strlen( pwd );
const unsigned char *buf;
mbedtls_pem_init( &ctx ); mbedtls_pem_init( &ctx );
ret = mbedtls_pem_read_buffer( &ctx, header, footer, (unsigned char *)data, ret = mbedtls_pem_read_buffer( &ctx, header, footer, (unsigned char *)data,
(unsigned char *)pwd, pwd_len, &use_len ); (unsigned char *)pwd, pwd_len, &use_len );
TEST_ASSERT( ret == res ); TEST_ASSERT( ret == res );
if( ret != 0 )
goto exit;
use_len = 0;
buf = mbedtls_pem_get_buffer( &ctx, &use_len );
TEST_EQUAL( use_len, out->len );
TEST_ASSERT( memcmp( out->x, buf, out->len ) == 0 );
exit: exit:
mbedtls_pem_free( &ctx ); mbedtls_pem_free( &ctx );