diff --git a/include/polarssl/x509_csr.h b/include/polarssl/x509_csr.h
index 4328598..deac88f 100644
--- a/include/polarssl/x509_csr.h
+++ b/include/polarssl/x509_csr.h
@@ -116,8 +116,8 @@
  * \param prefix   A line prefix
  * \param csr      The X509 CSR to represent
  *
- * \return         The amount of data written to the buffer, or -1 in
- *                 case of an error.
+ * \return         The length of the string written (exluding the terminating
+ *                 null byte), or a negative value in case of an error.
  */
 int x509_csr_info( char *buf, size_t size, const char *prefix,
                    const x509_csr *csr );
diff --git a/tests/suites/test_suite_x509parse.data b/tests/suites/test_suite_x509parse.data
index ba92716..54ef202 100644
--- a/tests/suites/test_suite_x509parse.data
+++ b/tests/suites/test_suite_x509parse.data
@@ -1165,3 +1165,80 @@
 X509 RSASSA-PSS parameters ASN1 (trailerField not 1)
 x509_parse_rsassa_pss_params:"A303020102":ASN1_CONSTRUCTED | ASN1_SEQUENCE:POLARSSL_MD_SHA1:POLARSSL_MD_SHA1:20:POLARSSL_ERR_X509_INVALID_ALG
 
+X509 CSR ASN.1 (OK)
+x509_csr_parse:"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":"CSR version   \: 1\nsubject name  \: C=NL, O=PolarSSL, CN=localhost\nsigned using  \: ECDSA with SHA1\nEC key size   \: 256 bits\n":0
+
+X509 CSR ASN.1 (bad first tag)
+x509_csr_parse:"3100":"":POLARSSL_ERR_X509_INVALID_FORMAT
+
+X509 CSR ASN.1 (bad sequence: overlong)
+x509_csr_parse:"3001":"":POLARSSL_ERR_X509_INVALID_FORMAT
+
+X509 CSR ASN.1 (total length mistmatch)
+x509_csr_parse:"30010000":"":POLARSSL_ERR_X509_INVALID_FORMAT + POLARSSL_ERR_ASN1_LENGTH_MISMATCH
+
+X509 CSR ASN.1 (bad CRI: not a sequence)
+x509_csr_parse:"30023100":"":POLARSSL_ERR_X509_INVALID_FORMAT + POLARSSL_ERR_ASN1_UNEXPECTED_TAG
+
+X509 CSR ASN.1 (bad CRI: overlong)
+x509_csr_parse:"30023001":"":POLARSSL_ERR_X509_INVALID_FORMAT + POLARSSL_ERR_ASN1_OUT_OF_DATA
+
+X509 CSR ASN.1 (bad CRI.Version: overlong)
+x509_csr_parse:"30053002020100":"":POLARSSL_ERR_X509_INVALID_VERSION + POLARSSL_ERR_ASN1_OUT_OF_DATA
+
+X509 CSR ASN.1 (bad CRI.Version: not v1)
+x509_csr_parse:"30053003020101":"":POLARSSL_ERR_X509_UNKNOWN_VERSION
+
+X509 CSR ASN.1 (bad CRI.Name: not a sequence)
+x509_csr_parse:"300730050201003100":"":POLARSSL_ERR_X509_INVALID_FORMAT + POLARSSL_ERR_ASN1_UNEXPECTED_TAG
+
+X509 CSR ASN.1 (bad CRI.Name: overlong)
+x509_csr_parse:"30083005020100300100":"":POLARSSL_ERR_X509_INVALID_FORMAT + POLARSSL_ERR_ASN1_OUT_OF_DATA
+
+X509 CSR ASN.1 (bad CRI.Name payload: not a set)
+x509_csr_parse:"3009300702010030023000":"":POLARSSL_ERR_X509_INVALID_NAME + POLARSSL_ERR_ASN1_UNEXPECTED_TAG
+
+X509 CSR ASN.1 (bad CRI.Name payload: overlong)
+x509_csr_parse:"300A30080201003002310100":"":POLARSSL_ERR_X509_INVALID_NAME + POLARSSL_ERR_ASN1_OUT_OF_DATA
+
+X509 CSR ASN.1 (bad SubjectPublicKeyInfo: missing)
+x509_csr_parse:"30143012020100300D310B3009060355040613024E4C":"":POLARSSL_ERR_PK_KEY_INVALID_FORMAT + POLARSSL_ERR_ASN1_OUT_OF_DATA
+
+X509 CSR ASN.1 (bad SubjectPublicKeyInfo: not a sequence)
+x509_csr_parse:"30163014020100300D310B3009060355040613024E4C3100":"":POLARSSL_ERR_PK_KEY_INVALID_FORMAT + POLARSSL_ERR_ASN1_UNEXPECTED_TAG
+
+X509 CSR ASN.1 (bad SubjectPublicKeyInfo: overlong)
+x509_csr_parse:"30173014020100300D310B3009060355040613024E4C300100":"":POLARSSL_ERR_PK_KEY_INVALID_FORMAT + POLARSSL_ERR_ASN1_OUT_OF_DATA
+
+X509 CSR ASN.1 (bad attributes: missing)
+x509_csr_parse:"3081973081940201003034310B3009060355040613024E4C3111300F060355040A1308506F6C617253534C31123010060355040313096C6F63616C686F73743059301306072A8648CE3D020106082A8648CE3D0301070342000437CC56D976091E5A723EC7592DFF206EEE7CF9069174D0AD14B5F768225962924EE500D82311FFEA2FD2345D5D16BD8A88C26B770D55CD8A2A0EFA01C8B4EDFF":"":POLARSSL_ERR_X509_INVALID_FORMAT + POLARSSL_ERR_ASN1_OUT_OF_DATA
+
+X509 CSR ASN.1 (bad attributes: bad tag)
+x509_csr_parse:"3081993081960201003034310B3009060355040613024E4C3111300F060355040A1308506F6C617253534C31123010060355040313096C6F63616C686F73743059301306072A8648CE3D020106082A8648CE3D0301070342000437CC56D976091E5A723EC7592DFF206EEE7CF9069174D0AD14B5F768225962924EE500D82311FFEA2FD2345D5D16BD8A88C26B770D55CD8A2A0EFA01C8B4EDFF0500":"":POLARSSL_ERR_X509_INVALID_FORMAT + POLARSSL_ERR_ASN1_UNEXPECTED_TAG
+
+X509 CSR ASN.1 (bad attributes: overlong)
+x509_csr_parse:"30819A3081960201003034310B3009060355040613024E4C3111300F060355040A1308506F6C617253534C31123010060355040313096C6F63616C686F73743059301306072A8648CE3D020106082A8648CE3D0301070342000437CC56D976091E5A723EC7592DFF206EEE7CF9069174D0AD14B5F768225962924EE500D82311FFEA2FD2345D5D16BD8A88C26B770D55CD8A2A0EFA01C8B4EDFFA00100":"":POLARSSL_ERR_X509_INVALID_FORMAT + POLARSSL_ERR_ASN1_OUT_OF_DATA
+
+X509 CSR ASN.1 (bad sigAlg: missing)
+x509_csr_parse:"3081C23081BF0201003034310B3009060355040613024E4C3111300F060355040A1308506F6C617253534C31123010060355040313096C6F63616C686F73743059301306072A8648CE3D020106082A8648CE3D0301070342000437CC56D976091E5A723EC7592DFF206EEE7CF9069174D0AD14B5F768225962924EE500D82311FFEA2FD2345D5D16BD8A88C26B770D55CD8A2A0EFA01C8B4EDFFA029302706092A864886F70D01090E311A301830090603551D1304023000300B0603551D0F0404030205E0":"":POLARSSL_ERR_X509_INVALID_ALG + POLARSSL_ERR_ASN1_OUT_OF_DATA
+
+X509 CSR ASN.1 (bad sigAlg: not a sequence)
+x509_csr_parse:"3081C43081BF0201003034310B3009060355040613024E4C3111300F060355040A1308506F6C617253534C31123010060355040313096C6F63616C686F73743059301306072A8648CE3D020106082A8648CE3D0301070342000437CC56D976091E5A723EC7592DFF206EEE7CF9069174D0AD14B5F768225962924EE500D82311FFEA2FD2345D5D16BD8A88C26B770D55CD8A2A0EFA01C8B4EDFFA029302706092A864886F70D01090E311A301830090603551D1304023000300B0603551D0F0404030205E03100":"":POLARSSL_ERR_X509_INVALID_ALG + POLARSSL_ERR_ASN1_UNEXPECTED_TAG
+
+X509 CSR ASN.1 (bad sigAlg: overlong)
+x509_csr_parse:"3081C43081BF0201003034310B3009060355040613024E4C3111300F060355040A1308506F6C617253534C31123010060355040313096C6F63616C686F73743059301306072A8648CE3D020106082A8648CE3D0301070342000437CC56D976091E5A723EC7592DFF206EEE7CF9069174D0AD14B5F768225962924EE500D82311FFEA2FD2345D5D16BD8A88C26B770D55CD8A2A0EFA01C8B4EDFFA029302706092A864886F70D01090E311A301830090603551D1304023000300B0603551D0F0404030205E03001":"":POLARSSL_ERR_X509_INVALID_ALG + POLARSSL_ERR_ASN1_OUT_OF_DATA
+
+X509 CSR ASN.1 (bad sigAlg: unknown)
+x509_csr_parse:"3081CD3081BF0201003034310B3009060355040613024E4C3111300F060355040A1308506F6C617253534C31123010060355040313096C6F63616C686F73743059301306072A8648CE3D020106082A8648CE3D0301070342000437CC56D976091E5A723EC7592DFF206EEE7CF9069174D0AD14B5F768225962924EE500D82311FFEA2FD2345D5D16BD8A88C26B770D55CD8A2A0EFA01C8B4EDFFA029302706092A864886F70D01090E311A301830090603551D1304023000300B0603551D0F0404030205E0300906072A8648CE3D04FF":"":POLARSSL_ERR_X509_UNKNOWN_SIG_ALG
+
+X509 CSR ASN.1 (bad sig: missing)
+x509_csr_parse:"3081CD3081BF0201003034310B3009060355040613024E4C3111300F060355040A1308506F6C617253534C31123010060355040313096C6F63616C686F73743059301306072A8648CE3D020106082A8648CE3D0301070342000437CC56D976091E5A723EC7592DFF206EEE7CF9069174D0AD14B5F768225962924EE500D82311FFEA2FD2345D5D16BD8A88C26B770D55CD8A2A0EFA01C8B4EDFFA029302706092A864886F70D01090E311A301830090603551D1304023000300B0603551D0F0404030205E0300906072A8648CE3D0401":"":POLARSSL_ERR_X509_INVALID_SIGNATURE + POLARSSL_ERR_ASN1_OUT_OF_DATA
+
+X509 CSR ASN.1 (bad sig: not a bit string)
+x509_csr_parse:"3081CF3081BF0201003034310B3009060355040613024E4C3111300F060355040A1308506F6C617253534C31123010060355040313096C6F63616C686F73743059301306072A8648CE3D020106082A8648CE3D0301070342000437CC56D976091E5A723EC7592DFF206EEE7CF9069174D0AD14B5F768225962924EE500D82311FFEA2FD2345D5D16BD8A88C26B770D55CD8A2A0EFA01C8B4EDFFA029302706092A864886F70D01090E311A301830090603551D1304023000300B0603551D0F0404030205E0300906072A8648CE3D04010400":"":POLARSSL_ERR_X509_INVALID_SIGNATURE + POLARSSL_ERR_ASN1_UNEXPECTED_TAG
+
+X509 CSR ASN.1 (bad sig: overlong)
+x509_csr_parse:"3081CF3081BF0201003034310B3009060355040613024E4C3111300F060355040A1308506F6C617253534C31123010060355040313096C6F63616C686F73743059301306072A8648CE3D020106082A8648CE3D0301070342000437CC56D976091E5A723EC7592DFF206EEE7CF9069174D0AD14B5F768225962924EE500D82311FFEA2FD2345D5D16BD8A88C26B770D55CD8A2A0EFA01C8B4EDFFA029302706092A864886F70D01090E311A301830090603551D1304023000300B0603551D0F0404030205E0300906072A8648CE3D04010301":"":POLARSSL_ERR_X509_INVALID_SIGNATURE + POLARSSL_ERR_ASN1_OUT_OF_DATA
+
+X509 CSR ASN.1 (extra data after signature)
+x509_csr_parse:"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":"":POLARSSL_ERR_X509_INVALID_FORMAT + POLARSSL_ERR_ASN1_LENGTH_MISMATCH
diff --git a/tests/suites/test_suite_x509parse.function b/tests/suites/test_suite_x509parse.function
index 5c4c29e..8f496b0 100644
--- a/tests/suites/test_suite_x509parse.function
+++ b/tests/suites/test_suite_x509parse.function
@@ -267,6 +267,34 @@
 }
 /* END_CASE */
 
+/* BEGIN_CASE depends_on:POLARSSL_X509_CSR_PARSE_C */
+void x509_csr_parse( char *csr_der_hex, char *ref_out, int ref_ret )
+{
+    x509_csr csr;
+    unsigned char *csr_der;
+    char my_out[1000];
+    size_t csr_der_len;
+    int my_ret;
+
+    x509_csr_init( &csr );
+    memset( my_out, 0, sizeof( my_out ) );
+    csr_der = unhexify_alloc( csr_der_hex, &csr_der_len );
+
+    my_ret = x509_csr_parse( &csr, csr_der, csr_der_len );
+    TEST_ASSERT( my_ret == ref_ret );
+
+    if( ref_ret == 0 )
+    {
+        size_t my_out_len = x509_csr_info( my_out, sizeof( my_out ), "", &csr );
+        TEST_ASSERT( my_out_len == strlen( ref_out ) );
+        TEST_ASSERT( strcmp( my_out, ref_out ) == 0 );
+    }
+
+    x509_csr_free( &csr );
+    polarssl_free( csr_der );
+}
+/* END_CASE */
+
 /* BEGIN_CASE depends_on:POLARSSL_FS_IO:POLARSSL_X509_CRT_PARSE_C */
 void x509_crt_parse_path( char *crt_path, int ret, int nb_crt )
 {